Leveraging Spirituality and Religion in European For-profit-organizations: a Systematic Review

This systematic review synthesises the available evidence regarding the European understanding of workplace spirituality (definitions), the importance of spirituality and religion (evidence) as well as spiritual leadership (meaning and practice) in for-profitorganizations. The search for eligible studies was conducted in OPAC Plus, SCOPUS, Science Direct, JSTOR, EBSCO, and Google Scholar from 2007/01 to 2017/07. Three independent scholars extracted the data. Twenty studies were included (two mixed-methods, eight quantitative, ten qualitative) for the final quality assessment. A study quality assessment and thematic analysis was conducted. This review gives suggestions for study quality improvement and reporting. Thematically, two different approaches to religion and spirituality (R/S) were detected: a) work has a spiritual dimension and b) religious and spiritual orientation as “spiritual capital”. Studies demonstrated positive effect on job satisfaction, health, commitment, company productivity and sustainability; Christian leadership does not address personal religious orientation; the spiritual dimension may lead to a change of perspective; workplace spirituality may exploit people for profit-oriented business goals; non-white Muslims experience discrimination. This systematic review provides robust evidence and findings for evidence-informed policymaking and encourages a more rigorous research in this field of study.


Introduction
Studying workplace spirituality is an open field of research that examines spiritual and religious orientation(s) at different levels, such as individual, organizational and societal, and analyses its consequences for educational, managerial and marketing purposes. The evidence demonstrates that to succeed and improve, all profit-oriented organizations must constantly be on the lookout for values and norms that support sustainable human resource management, advance the image of the organization (branding) and help to produce products that are in compliance with societal norms and consumer values. Thus, there is growing pressure to not only produce accordingly, but also to represent and live these values within the organization. Therefore, current leadership and Human Resource Management (HRM) research is constantly searching for solutions supporting the growth of emotional, spiritual, cultural, intentional and appreciative intelligence in leaders and decision-makers (Martin and Hafer 2009;Šilingienė and Škėrienė 2015;Parkkali et al. 2015;Rosenauer et al. 2016;Kaufmann and Gaeckler 2015;Kaufmann and Wagner 2017). The ability to manage the 'spiritual capital' in the workplace has been called "the missing link in the process of human development that should be identified and considered as an important factor for developed and morally qualified human resources" (Ahmed et al. 2016, p. 165). Accordingly, the ongoing discussions call for a turn in management styles, in particular, when facing the challenge of HRM in the workplace.

Cultural Diversity and Human Resource Management
Modern HRM is a wicked problem, because trying to change a single agent calls for large system initiatives (Waddock et al. 2015). Current HRM faces numerous challenges, such as motivating and keeping elderly employees (Kurek and Rachwał 2011, Sturz and Zografos 2014, Vasconcelos 20152018), while making organizations attractive for Generations Y and Z , Brown et al. 2012, Baumane-Vītoliņa et al. 2017, Chawla et al. 2017, supporting female (Bark et al. 2014) and LGBTIQ+ journeys (Köllen 2016, Pichler et al. 2017, maintaining an appropriate work environment for people with disabilities (Hogan et al. 2012, Kulkarni andRodrigues 2014) and addressing employees' struggles with various lifestyle and health issues, such as diabetes (Stynen et al. 2015), obesity (Levay 2014), alcohol and substance abuse (Belhassen and Shani 2012) or helping those suffering from violence at home or at the workplace (Alsaker et al. 2016).
In addition to these aspects, there is the paramount problem of how to adapt to the manifold cultural identities in the workplace. This challenge spans from international talent management (Gallardo-Gallardo et al. 2020) to expatriate issues (Lazarova et al. 2010), as well as leveraging multi-ethnic, national and religious identities (Byrne et al. 2011, Tracey 2012, Ghumman et al. 2013, Khattab and Johnston 2015. To overcome these and other HRM challenges, adopting a model of workplace spirituality might seem a useful forthcoming initiative.

Workplace Spirituality -Fostering Oneness and Belonging
Many of the empirical studies have demonstrated a positive effect of spirituality on job commitment, satisfaction and performance. The conventional strategy of organizations lies in helping their employees flourish by enhancing the individual's knowledge, skills, abilities and emotion control (Ahmed et al. 2016). Accordingly, spiritual values in employees have been positively associated with their mental well-being and low occupational stress, whereas the spiritual practices are positively associated with low work-related exhaustion and burnout (Arnetz et al. 2013;Nowrouzi et al. 2015). Other studies are demonstrating positive results in employees' altruism and conscientiousness, self-career management, reduced inter-role conflict, reduced frustration, organization based self-esteem, involvement, retention and ethical behaviour (Geigle 2012). Based on earlier findings, it can be concluded that spirituality benefits employees and supports organizational performance by enhancing employee well-being and quality of life, providing a sense of purpose, meaning, interconnectedness and community (Karakas 2010). The problem is that these studies have applied measures that enable understanding spirituality, spiritual needs and personal growth in individual employees or managers, however, the challenges and changes at group and organizational level have been largely neglected (Alcázar et al. 2013;Kulik 2014;Sullivan and Baruch 2009). Thus, there is a solemn need to explore and measure the effectiveness of diversity management activities in order to understand why, when and where adopting a workplace spirituality model might be forthcoming.
An additional problem is that there is no consensus on what workplace spirituality actually means. It has been suggested that in spiritually driven workplaces, people follow the model of minimization -meaning that they tend to highlight their similarities and ignore their differences (Ameli and Molaei 2012). Workplace spirituality has been linked to the 'oneness principle' indicating that "when you see no other, you help and support the correspondent no matter what his or her position/race/religion." (Çelik 2012, p. 71). Accordingly, it is to be understood as a construct delivering a sense of connectedness or belonging linked to workplace specific moral boundaries and values.

Workplace Spirituality and Religion
When examining workplace spirituality and spiritual leadership, most researchers combine spirituality and religion (Dent et al. 2005), which is problematic for several reasons. Workplace spirituality is aiming at minimizing differences by creating an organizational system of meaning and delivering the message of community. Accordingly, "many organizations appear increasingly willing to play the role of secular religion, where the founders may become deities of sorts; key insiders may become clergy; jobs, callings; institutionalized processes, rituals; and failings, sins." (Ashforth and Vaidyanath 2002, p. 359). Creating an Olympus, a workplace full of gods and good will, no matter how innovative and inspiring, has its downsides calling for caution, in particular, when it comes to respecting employees as individuals each with their cultural and religious attachments.
Ignoring the issue of formal religion over workplace spirituality may have serious consequences for individuals, organizations and for societies (Alidadi and Foblets 2012). The consequences have not been examined and understood yet, however, Karakas has identified common problems connected to (mis)managing workplace spirituality. First and foremost is the danger of proselytism (the attempt to convert people to another religion or opinion), followed by the issue of compatibility, the risk of spirituality becoming a fad or a management tool to manipulate employees, the legitimacy problem the field of spirituality at work faces in theory, research and practice, the accommodation of spiritual requests, respect for diversity, openness and freedom of expression as well as acknowledgement of employees as individuals (Karakas 2010). This extensive list of problems clearly calls for an intelligent approach not only regarding management styles, but also in research.
It appears that the contradiction between implementing workplace spirituality models at work and (dis)respecting worker's religion has led to a point, where many people simply wish that religion had no foothold in the workplace (Borstorff and Arlington 2011). This is all the more reason to take employees' religious and faith-related needs seriously, when studying workplace spirituality and spiritual leadership.

Aims and Objectives
For the past decade, the meaning of spirituality and religion in the workplace and in HRM has been the topic of many academic research endeavours. The importance of this topic for research becomes apparent considering the number of published books (Antwi 2017;Charles 2016;Farina 2015;Fry and Altman 2013;Lalani 2014;Marshall 2012;Morton 2015;Mugalu 2010;Ngambi 2011;Peltonen 2017;Scalise 2007) or scientific reviews conducted to investigate, explore, and discuss the various aspects of workplace spirituality and the management of religion and/or spirituality (R/S) at the individual, organizational or societal level. Previously conducted reviews (Lizardo 2011;Ratnakar and Nair 2012;Tracey 2014;Tracey 2012;Ghumman et al. 2013;Miller and Ewest 2013;Balog et al. 2014;Habib Rana and Shaukat Malik 2016) have proposed arguments, conclusions and recommendations, which are contradictory and inconclusive. Therefore, the principal questions regarding what is workplace spirituality, why workplace spirituality matters, how to manage workplace spirituality and what to do about religion at the organizational level, still remain relevant. As the majority of evidence regarding managing R/S at organizations stems from non-European countries (Hashim et al. 2015), the following review pays special attention to knowledge and evidence emerging from the European context.

Methods
This is a systematic review of literature to provide a complete and comprehensive summary of evidence on how to leverage spirituality and religion in for-profit-organizations in the European context. The findings of this review are presented according to the PRISMA (Moher et al. 2010) guideline. The study protocol was published on ResearchGate on February 2, 2018 (Paal 2018).

Eligibility
This review considered quantitative, qualitative and mixed method studies. Quantitative designs include experimental studies (including randomized controlled trials, non-randomized controlled trials, other quasi-experimental studies including before and after studies) and observational designs (descriptive studies, cohort studies, cross sectional studies, case studies and case series studies). Qualitative designs include any studies that focus on qualitative data, such as, but not limited to, case studies, grounded theory, ethnography designs or discursive analysis.
This review concentrated on studies published between January 2007 and July 2017. Only publications in the English language are included. Books, book chapters, book reviews, conference proceedings, editorials and theses are excluded from this review.
For inclusion/exclusion decision making, we applied the following PICO framework (Schardt et al. 2007): • Population: Adult workers and managers of any for-profit-organization in European countries. • Intervention: Any introduction/application/assessment of R/S in the workplace at group or organizational level. • Comparison: Any methods applied, including comparison between European and non-European countries. • Outcomes: Any reported outcomes on R/S in the workplace at group or organizational level, or in management.

Exclusion Criteria
We excluded adolescents, retired, unemployed workers, stakeholders, ethnic minorities or expats at non-profit and governmental organizations, private or public military, prison, church, school, higher education unit, health institution, virtual teams and digital society or workforce outside the workplace in non-European countries. Also excluded were studies tackling knowledge transfer, communication, organizational or life-long-learning, analysing and exploring organizational change, workplace issues and leadership challenges without an explicit connection to spirituality and religion.

The Search Strategy
The search strategy was deliberately kept broad in order to map the range of topics hypothetically connected to the workplace R/S, R/S in HRM and spiritual leadership. The MeSh browser (Mesh on Demand n.d.) was visited to extend the search words. Regular meetings were held to discuss the primary findings in order to fine-tune the search strategy and key words. Word combinations and search terms were used as demonstrated in the following figure ( Fig. 1). The search was conducted by two independent scholars in following electronic databases and generic search engines: (1) OPAC Plus (2007/01-2017/07) (2) SCOPUS Selected literature reviews (Sturz and Zografos 2014;Tecchio et al. 2016;Karakas 2010;Balog et al. 2014;Drenten and McManus 2016;Geigle 2012) and three journals (Journal of Management, Spirituality and Religion, Journal of Organizational Change Management and Journal of Management Development) were also searched manually.

Synthesis and Analysis of Outcomes
Three investigators (LM, PP, AKS) independently: (1) extracted the data, (2) evaluated the study quality, (3) coded and categorized and finally (4) synthesized the findings to answer the review questions.
• The data was extracted by three investigators (LM, PP, AKS) independently using an Excel based data extraction matrix comprising and describing the elements that respond to the objective of this review ( Fig. 1. Data extraction matrix). The matrix was developed in accordance with the primary literature search findings. • The study quality appraisal was done by three independent investigators (LM, PP, AKS) following the QualSyst scoring system for qualitative and quantitative studies (Kmet et al. 2004). Consensus discussions were held to solve any interrater disagreements. • Two independent investigators (LM, AKS) coded and categorized the findings using the line by line coding to search for research questions, definitions, best practice models and central findings. The derivation of themes was data based. • LM and PP synthesized the qualitative findings according to the thematic synthesis of qualitative research in systematic reviews (Thomas and Harden 2008). Consensus discussions were held upon presenting the final findings.

Risk of Investigator Bias
Extensive search of databases was conducted by two independent investigators (PP, LM). Different search strategies and search words/algorithms (sometimes with limitations on site, such as "-books") were applied to exploit the benefits of each search platform. Double checks in reviews, journals, and special issues demonstrated that our online search had included the majority of relevant publications to answer the review questions. This review concentrates on studies of European origin and focused on literature published only in English. Depending on regional policies, socio-economic situation and local research priorities, the investigated topic may be more relevant in some European countries than in others, and depending on cultural background, scholars may use different concepts and notions having explicit or implicit connection to spirituality and religion.
To diminish investigator bias, an interdisciplinary group of investigators was involved in conducting this review. The investigators are experts in different fields (economics, theology, cultural sciences), know different regions of Europe by origin or longer periods of residence (Eastern Europe, Scandinavia, Germany) and have a number of languages at their disposal (English, German, French, Russian, Italian, Finnish, Baltic and Scandinavian). All authors have Christian backgrounds.

Results
The search results from two independent investigators (PP, LM) were merged using the reference management software Endnote TM . The automatic removal of duplicates resulted in 2331 hits for the preliminary screening. The dual screening of titles and abstracts for eligible studies resulted in identifying 89 studies for the article reading (Fig. 2). During the first read, 17 articles did not meet the primary inclusion criteria linguistically (Rego 2007;Santiago 2007

The Study Quality Appraisal
Three independent investigators conducted the study quality appraisal following the Qual-Syst scoring system (Kmet et al. 2004). The score sheet for qualitative studies consists of ten items and the one for quantitative studies, 14 items. In all quantitative studies, the randomizing or blinding interventions (items 5 to 7) were not applicable. Respectively, the maximum score for qualitative studies was 60 (3 × 20) (Fig. 3) and for quantitative studies 66 (3 × (28-(3 × 2))) ( Fig. 4). The two mixed-method studies (Bakanauskiene and Katiliene 2015; Kupczyk et al. 2015) were assessed in both categories.
To reflect on the overall study reporting quality, we looked at the single item reporting quality across the included studies. As each investigator could rate the items with a maximum of two points, each item could be scored with a maximum of six points. For the analysis, we calculated the average score of each item for both study types, qualitative and quantitative. Qualitative studies (Fig. 5) scored low in items reflecting study design and justifying sampling strategy. Serious flaws were detected in methods applied to data analysis to verify the credibility of outcomes. None of the quantitative studies (Fig. 6) represented randomized controlled studies. Overall the studies failed to justify the participant/ group selection, which led to significant weaknesses in reporting analytic methods and confounders.

Fig. 3
Quality assessment results for qualitative studies according to the QualSyst scoring system (Kmet et al. 2004). * Kupczyk et al., 2015, conducted a mixed-method study but did not report sufficiently on the qualitative approach, which hindered the quality appraisal

Question 1: What is Workplace Spirituality?
There is no consensus regarding the concept of spirituality in the workplace. It is usually not identified with religion or associated with specific religious traditions, but interpreted more broadly (Izak 2012). It can include any ideological or philosophical orientation of values that exist within a company or an employee. Although spirituality is associated with a variety of dimensions and levels ("multidimensional, multilevel phenomenon") (Kumpikaitė-Valiūnienė 2014), two common denominators can be identified: (1) The need and -if successful -the experience of achieving meaningful work that corresponds to one's Quality assessment of single items in reporting quantitative data according to the QualSyst scoring system (Kmet et al. 2004) own values, helps others and possibly serves the greater good.
(2) The experience of connecting with other people, initially at work and then after work with partners and customers and, if the need arises, over and above creating long-term bonds. People want to grow personally through their work and make a contribution to society. They want to be connected ("the yearning for connectedness and wholeness") (Izak 2012;Kumpikaitė-Valiūnienė 2014) and desire meaningfulness and happiness (Neal and Vallejo 2008;Cleary et al. 2015;Rego and Pina e Cunha 2008). The connection with the transcendent is explicitly mentioned in different ways (Zsolnai and Illes 2017). Trust among each other is considered to be a central basis . Spirituality in the workplace, therefore, results in a combined, appealing performance and quality orientation that goes beyond the usual values such as independence, competition and acquisition (Kumpikaitė-Valiūnienė 2014).
The term "spiritual capital" is derived from the organizational and economic context. It was initially chosen by the William Templeton Foundation at the beginning of the 21st century for "social capital" created by religious communities for the socially disadvantaged. It then was extended to mean "secular" spiritual capital in other contexts, i.e. for the set of values, ethical points of view and visions of individuals as well as of groups and institutions. This includes anything that gives life a sense and meaning, such as relationships of all types. Spiritual capital is considered to be a source of motivation for the other forms of capital in a company .
The utilisation of the broad term spirituality for empirical research is the centre of many studies, sometimes combined with an initial empirical evaluation of one's own approach (Bakanauskiene and Katiliene 2015; Rego and Pina e Cunha 2008). Rego and Pina e Cunha identified five dimensions that make both the organizational commitment and the individual meaning of work visible as essential components of workplace spirituality: Experience a sense of community in their work teams, feel that their values are aligned with those of the organization, consider that they do meaningful and helpful work, experience enjoyment at work and consider that the organization gives them opportunities for their inner life (Rego and Pina e Cunha 2008, p. 62-64). Neal and Vallejo have similar aspects for the basis of their study, in that they distinguish the following five dimensions for "Spirit at work": (1) the physical dimension (a positive environment and energy), (2) the affective (a feeling of joy and deep satisfaction of well-being), (3) the cognitive (a feeling of being authentic and a connection of personal values with one's own work and the awareness of doing meaningful work that has a higher goal), (4) the interpersonal (a feeling of connectedness with each other and with a common goal) and (5) the mystical dimension (a spiritual presence, characterized by a feeling of connection with something greater, the transcendence and the experience of inspiration and something sacred). Religion is also considered to be institutionalized spirituality (Neal and Vallejo 2008).
Mazereeuw-van der Duijn Schouten et al. look towards "religiosity". They also describe a complex phenomenon of cognitive, affective-motivational and behavioral aspects, but emphasize institutional integration. Religiosity is "an orienting worldview that is expressed in beliefs, narratives, symbols and practices of worship" (Mazereeuwvan der Duijn Schouten et al. 2014, p. 440). It includes both the inner experience of the individual and the connection with others. For research, they consider it sufficient to choose a few key characteristics, in particular the distinction between intrinsic form (religiosity as a framework for interpreting one's own life) and extrinsic form (dominance of social requirements) (Mazereeuw-van der Duijn Schouten et al. 2014).
With regard to spirituality in the context of an organization, it is important to distinguish the levels of personal spirituality of employees and organizational spirituality to understand their connection. Hence, the forming of a theoretical foundation based on the various concepts of spirituality as well as on the relationship between organizational structure and spiritual leadership is only in its infancy (Bakanauskiene and Katiliene 2015; Kumpikaitė-Valiūnienė 2014).

Question 2: What Effect Does Workplace Spirituality Have for People and Companies in Profit-oriented Businesses?
Companies that manage to establish spiritual values have had many positive experiences, both for the individual employee and for the company. For the employees (1) the experience of an appreciative and "spiritual" work environment contributes to a higher emotional well-being and job satisfaction, contentedness and better health

Global Perspective and Sustainability This value orientation often underlines the need to
consider global values, i.e. perspectives with regard to sustainability . A solid spiritual foundation is now considered to be one of the important factors in the commitment to sustainability. According to Stokes at al.: "VBA [Values, Beliefs, Attitudes] makes an often hidden, even mundane, but also very powerful, contribution to human capital. It potentially enhances the value of every member of the company by creating additional conditions and dimensions in which their 'knowledge, capabilities and skills' can be better expressed, thus enhancing their sense of emotional wellbeing and job satisfaction, which in turn minimizes the more destructive and inimical practices that were highlighted within the corporate setting.
[…] Second (and linked to the point above), the drivers and application of VBA can be seen to have a multi-levelled impact: from the smallest attention to detail that makes an employee feel valued and noticing another's struggles and engaging empathically, through to standing up of the underdog in the face of perceived miss-management or corruption within the structures of the business. Occasionally, VBA highlights the role of business as part of a wider web of interconnectedness that directly connects with global ethical agendas concerning, for example, the well-being of the planet as a whole." (Stokes et al. 2016, p. 48).
Conversely, this means that the prevailing neglect of spirituality hides possible resources for individual and company performance.

Question 3: Risks of Mismanagement of Spirituality in the Workplace
In the interests of the economy, should individual employees with their diverse cultural backgrounds be placed into the interest of the profit orientation of the business? Cullen & Turnbull warn against the dangers of "soft capitalism", which puts the whole person in the service of a capitalist company, namely with the neoliberal rhetoric of a new culture of work and organization, the emphasis on self-motivation and self-realization and an authentic self-existence. Such self-centred management development initiatives extend their impact beyond work, to people's aims in life and relationships (Cullen and Turnball 2012).
Approaches to organizational spirituality, which focuses on the congruence of values and the sense of belonging, need political agendas and power structures for their critical corrective analysis. Izak examined some recent studies and questions and their positive aspects of organizational spirituality. He advocates that future research should focus even more on the political aspects, power structures, methods of asserting influence and providing support (Izak 2012). On the other side, an appreciative and "spiritual" work environment can lead employees to courageous activities, e.g. identifying mismanagement or corruption ).

Question 4: The Contribution of People's Religious Orientation to "spirituality" in the Workplace
Religion in the workplace has so far been regarded as a diversity factor. Influences beyond this have not yet been investigated much. In the studies at hand, Christianity as a religious background, has formed the basis for this investigation involving a variety of questions. A common result is that religion and spirituality show up at the workplace through various values and attitudes Stokes et al. 2016;Zsolnai and Illes 2017).
The studies show that executives and other company employees emphasize the following values: (1) Integrity, sincerity, transparency and trust, (2) reflection on mistakes and constructive criticism of faults, (3) empathy and concern for colleagues, also in an altruistic way instead of constant orientation to fast and inexpensive work, (4) respect and fair dealings with each other and with customers and (5) minimizing hurtful and stressful outcomes. The aim is to compensate for social differences (bridging and linking social capital), build social solidarity and mitigate the dangers of a closed group mentality ). The focus is on promoting social togetherness as an expression of Christian charity Stokes et al. 2016;Zsolnai and Illes 2017). Charity, thus, becomes an organizational principle ). Stokes et al. observe that Christian leaders and company members in the UK find it important to have a culture of dealing with mistakes (importance of forgiving), whereas Răducan and Răducan in Romania show a low level of dealing with conflicts and criticism among Orthodox Christian workers Răducan 2013a, 2013b).

Tolerance of Religious Diversity Among Dutch executives, the influence of intrinsic
Christian religiosity on the question of diversity was shown to be negative. Traditional Protestant and Catholic teaching and patriarchal ecclesiastical structures are assumed to be the basic reason for this . In Romania, Orthodox Christianity is considered to be tolerant of religions. Romanians who see themselves as (very) Orthodox Christians have no problem working for a Muslim entrepreneur. In their experience, religion at the workplace is irrelevant and there were no experiences of religious restrictiveness (Zaharia and Benchea 2013).

Special Features: Dependence on Culture and the Religious Composition of the Company Board
In Swiss companies, confessional-cultural attitudes showed to have an influence on the company's economic and corporate style. In particular, on the willingness to either tolerate company power structures, promote them or influence management and control structures. "Most importantly French, Swiss-French, and Roman Catholics tend to tolerate hierarchical structures and strong leadership. In contrast, German, Swiss-German, and Protestants tend to be skeptical towards a concentration of power" (Volonté 2015, p. 79). The study provides empirical evidence that culture and values related to tolerance for hierarchical structure directly affect board structure: "Swiss-German boards and boards in Protestant cantons are commonly observed to have a two-tiered board structure.
[…] In the Swiss-French area and in Roman Catholic cantons, one-tier boards are more prevalent, which necessarily results in concentrations of power" (Volonté 2015, p. 103). The former aim is to limit the concentration of power; the latter promotes it. While the 'board composition' is significantly determined by culture, religion and language, ownership as well as capital structure ("equity structure") are not significantly dependent on it (Volonté 2015).

Differences Between West and East
The fact that Christian values and a corresponding workplace spirituality contribute to successful company management is a conviction far higher among Christian managers in Western Europe than among Christian blue-collar workers in Lithuania (managers were not interviewed here). A connection with the communist past is suspected to be the reason here (Kumpikaitė-Valiūnienė 2014).

Explicitness of Religion in a Secular Society
Religious orientation is frequently not displayed directly, but through values and attitudes. The authors suspect that the obstacles to a secular society, i.e. the hostility towards religious values that religious leaders also notice and feel from non-religious leaders, to be the reasons (Mazereeuw-van der Duijn Schouten et al. 2014). Stokes et al. raise the question of the extent to which this self-censorship is self-imposed, or a consequence of a secular based hostility to religion in the public domain, "whereby only the secular is perceived as neutral and therefore eligible for public consumption, and the religious is deemed fit only for private expression (but see also the provision of prayer rooms for staff in many UK firms which contrasts favorably with other EU settings such as in France where work and religion are considered incompatible" (Stokes et al. 2016, p. 49).

Question 5: Religious Diversity and Forms of Discrimination
The study by Kupczyk et al. notes that the level of diversity management implementation in Poland is rather low. This is related to the fact that trust in organizations is rather low, much lower than trust in management or in colleagues . Based on the findings of the study by Mazereeuw-van der Duijn Schouten et al. (2014), however, it would be important to know if there is a connection between confidence in organizations and the religious orientation of the managers.
Uncertainties about diversity, especially about other languages and other religions, are greater in family businesses in Germany, Switzerland and Austria than in non-family businesses. Consequently, family businesses in these countries regard internationalisation of their products for more distant countries to be riskier than in the neighbouring countries (Mensching et al. 2016). In the UK, non-white and, especially, Muslim men and women experience discrimination. The discrimination is particularly evident towards higher positions and management levels. "In the case of non-whites, particularly Muslim minorities, there is a clear hierarchy in the penalty they face between the stage of finding a job -any job -and joining the salariat class. This means that through their employment careers some individuals will face an increasing penalty as they seek to advance from a given level to a higher one" (Khattab and Johnston 2015, p. 11-12).
A small case study shows how Muslim women of an ethnic minority (Dawoodi Bohra community) manage to maintain their Islamic identity running their small businesses, even increase their honour in their community and, at the same time, avoid conflict with Sweden's secular host society (Pio 2010).

Question 6: How Can Spirituality be Promoted in For-profit Business? The Importance of Spiritual Leadership
Promoting workplace spirituality requires new creativity (Šilingienė and Škėrienė 2015; Zsolnai and Illes 2017), a "spiritual intelligence" of managers whose personalities (honesty, appreciation) are committed to ideas and values (including confidence and care), interactions with employees and customers (trust, communication, flexibility, an eye for talent and involvement) and also showing alignment with the performance of a company (life satisfaction, commitment, corporate responsibility, continuous improvement, productivity) (Bakanauskiene and Katiliene 2015).
"Spiritual Leadership", which is regarded as a generic term for concepts such as, "business ethics", "values-based leadership" and "corporate social responsibility" brings about a change of perspective by shifting values, e.g. common good before individual capitalist interests, mutual trust before mutual market advantages, social commitment before selfish behaviour and basic needs before subjective preferences. According to Copenhagen Business School scholar Peter Pruzan (2011) "spiritually based leadership considers ethics, social responsibility and sustainability not as instruments to protect and promote the classical business rationale, but as fundamental goals in their own right" (Zsolnai and Illes 2017, p. 198). This could create a certain independence, which enables creative and ethically responsible solutions to be found for the complex challenges and goes beyond a purely instrumental rationality and materialistic orientation that contributes to major social and environmental problems (Zsolnai and Illes 2017).

Interventions -Two Examples
Researching ways that support people in leadership and management in their spiritual dimension, the studies examined the effects of two rather extensive interventions that pursue conflicting interests. On the one hand, managers were offered possibilities for promoting spiritual development with the aim that their spiritual direction will lead to better corporate values. This showed largely positive results, depending on the spirituality or religiosity of the individual (Cullen 2011). On the other hand, the focus was on how leadership is influenced by a spiritual, or similar, attitude (meditation) and regular experience sharing; this structure gave the individual support so that the participants did not relapse into old work pattern routines (Lychnell 2017).

Discussion
The global discussion on workplace spirituality and spiritual leadership is ongoing (Altman et al. 2022;Moll 2021a, 2021b;Brügger 2021;Moll 2022). World leaders call for value-based decision making in order to guarantee decent work for all and promote sustainable economic growth. The papal Encyclical "Laudato Si'" from 2015 states that "leadership capable of striking out on new paths and meeting the needs of the present with concern for all and without prejudice towards coming generations" (p. 38) is lacking (The Holy Father Francis 2015). In 2015 in New York, world leaders agreed to the key role of decent work for all in achieving sustainable development. This is highlighted by Sustainable Development Goal 8 -SDG 8 -(implemented since 2016) which aims to "promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all" (p. 2), including people with disabilities, women, young and older workers, cultural and indigenous minorities as well as migrants. "Furthermore, crucial aspects of decent work are broadly rooted in the targets of many of the other 16 goals" (United Nations 2015, p. 19). Respecting cultural and with that religious diversity as well as personal development and social integration is part of decent workplace practice and calls for special rights and measures at work. Fostering workplace spirituality and religious orientations and expressions at work could be supported by "Good Religious Practice" as SDG 8. Ulrich Hemel of Weltethos-Institut Tübingen proposed this at the UNESCO Summer School in Lucerne in June 2019 to encourage the dialogue between politics, economy and religion (Hemel 2019, p. 250). The research regarding workplace spirituality is concentrated in America, Asia and the Islamic World (Pirkola et al. 2016). Nevertheless, since the turn of the millennium, the subject of workplace spirituality has received greater attention in Europe as well (Zsolnai and Illes 2017).
Following the global call for better and more integrative workplaces, the present systematic review investigated the spiritual dimension in European for-profit-organizations, focusing on explicit religious or spiritual management goals and pondering facilitators and barriers in leveraging R/S in workplace, leadership, and employee bonding.
Based on the search conducted in a wide range of databases, earlier reviews and peerreviewed journals, our study demonstrates that specific cultural and regional aspects of R/S in the workplace are of particular importance in the European context: (1) Individual countries have a different history of "secularity" or "laïcité", and correspondingly, different requirements to address R/S in the workplace. (2) Denomination and religious diversity are defining parameters. (3) The influence of an ex-communist background can also cause divergences.
Of the twenty studies available, eight come from Central and Eastern European countries (Lithuania: 2, Poland: 2, Hungary: 1, Romania: 3), four from the English-speaking region (Ireland: 2; UK: 2), two from Sweden, two from the German-speaking regions (Germany, Austria, Switzerland, incl. French-speaking Switzerland), one from the Netherlands, two from Spain and one from Portugal.

Limitations
The data were checked in different databases demanding variations in search strategies and algorithms, which affects the transparency and replicability of this systematic review. The search was conducted including literature from 2007/01 to 2017/07. The articles published after 2017/07 are referred to, but not systematically analysed in this paper. A large number of studies were excluded based on pre-defined inclusion/exclusion criteria. By not including the numerous studies conducted in Turkey may have led to implicit bias as there is no comparison of spirituality and religion in the Islamic working worlds. This would, however, be desirable to have in our plural and global work contexts in Europe.

Strengths
This systematic literature review was reported following the PRISMA guidelines. The study protocol was based on broad preliminary search that was finalized as rigorous search strategy with database appropriate search algorithms and clearly defined inclusion/exclusion criteria. The research questions are specifically focused (Schardt et al. 2007), which is to ensure that the review process remains focused. Three independent investigators were working on screening, data extraction, study quality assessment and thematic analysis at different stages of the process. All included studies are presented according to research design, methodology, data, assumptions made and study quality. Despite the inevitable risks of investigator bias, we believe that the results of this systematic review provide robust evidence and valuable findings for evidence-informed policymaking and encourage a more rigorous research in this field of study.

Conclusions and Recommendations
The major findings of the research show two different approaches to religion and spirituality (R/S) in the workplace: (a) Work as a form of self-development and world formation, and, in the broader sense, having spiritual dimensions when associated with the search for meaning and the transcending of oneself. (b) How religious and spiritual orientation becomes allied to the workplace and corporate culture in the form of "spiritual capital".
The spiritual needs of people at work become part of a search for meaningful work that corresponds to their own values, a search for a contribution to society, to the community, to responsibility for the whole in the sense of sustainability and for a purpose in life and happiness. The studies show that taking these aspects into account has a positive effect on job satisfaction, health and affective and normative commitment of employees, thereby promoting company productivity and sustainability. According to the studies available, leadership and staff did not openly admit a personal religious orientation towards the Christian faith (only this aspect was available for the studies) as these aspects were hidden in the corporate culture. This proved to have a positive effect through significant commitment to social cohesion and inclusion, but a negative effect through distrust, or at least insecurity, with handling religious diversity. Trust and love were also examined in the framework of principles within an organization. If leadership had a real interest in the spiritual dimension, this would lead to a change of perspective. Maximizing profits would become less important than the values of personal development of employees, greater job satisfaction, bonding and sustainability. However, the studies also point to the danger that, through the concepts of workplace spirituality, people may be exploited for profit-oriented business goals. When looking for work and especially when moving up to higher positions, nonwhite Muslims (both men and women) in particular experience discrimination. In view of the importance of spirituality in the workplace and the growing religious-cultural diversity, the question is raised, whether the time is ripe for religion and spirituality to be taken out of the taboo and private sphere and put into the economic context.

Implications for Evidence-based Policy-making
In the past, it has been argued that in European societies, R/S has been to a larger extent "privatized" (Luckmann 1996). The concern of counteracting privatization and tabooing and the need to discuss spirituality and religion in the work context, can be understood as an expression of "enlightened respect". "Secularity today does not mean the opposite of religion, but rather, consciously enabling pluralism" (Fiedler 2015, p. 125). Of course, after having been tabooed and privatized for so long, this change requires learning processes, (self-)reflection as well as development of language.
Overall, religion and spirituality are still very much neglected by business enterprises in Europe. Recent studies show that in German-speaking countries, workplace spirituality is less implemented in diversity management and HRM, considering R/S a private matter and being afraid of negative consequences of religions 'violence potential' (Alewell and Rastetter 2020). The findings "suggest that the more businesses can be open to acknowledging the existence of both religious and secular expressions of spiritual capital the more humane and therefore the more productive their corporate environment is likely to be. The more spaces and places in which staff can be facilitated to express their deepest values, beliefs and attitudes for positive change and the well-being, then the more authentically connected they will feel to the roles that have been assigned to them" (Stokes et al. 2016, p. 49). The studies evaluated in this review show the need to differentiate between the spiritual needs that connect many people to their work and work environment and the different cultural and religious backgrounds of the individuals. The question is how spirituality in the workplace is connected to the specific needs of various religions, free space and forms of expression and whether there is time and a place in companies for this. Can promoting workplace spirituality in companies help increase respect for religious diversity in its various forms and can it also help to find creative solutions?

Implications for Future Research
Empirical research, as well as theory building and model development for workplace spirituality and spiritual leadership with its connections within Europe to profit-oriented businesses, is still in its initial stage. This, however, should not affect the study quality and the quality of data published. Our review provides suggestions for improvements.
This systematic review presented workplace spirituality as problematic, which indicates that research must be contextualized and the population as well as the methods to investigate R/S and workplace spirituality carefully chosen. It became evident that the available tools to measure R/S and workplace spirituality are not appropriate for the European context. The issue that adequate conceptions and assessment instruments are missing, such as in German-speaking countries, has been raised in other studies (Moll 2020). Albeit other voices, in particularly in the healthcare sector, warn against an instrumentalisation of S/R (Best el al. 2020). Further investigations of the connection of workplace spirituality and R/S with social determinants and health (e.g. based on absenteeism) is also needed. In particular, long-term studies and studies with control groups are entirely missing.
Author Contributions LM and EF devised the project and the main conceptual ideas. LM and PP performed the preliminary and final literature search. PP worked out the study protocol. LM, PP and AKS extracted the data and preformed the quality assessment. LM and PP wrote the manuscript. All authors contributed to the article and approved the submitted version.
Funding Open Access funding enabled and organized by Projekt DEAL. This work was supported by Karl Schlecht Stiftung.

Data Availability
The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request.

Code Availability
The search and data extraction strategy is presented in the paper.

Conflict of Interest The authors confirm that there is no conflict of interest.
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