A University of Warwick professor who spent three decades studying the intersection of psychology and faith has found consistent patterns suggesting that personality types may play a significant role in determining which denomination of Christianity people choose to attend, according to research published in peer-reviewed journals.
Leslie Francis, an ordained minister and author of numerous studies on psychological type and religion, administered personality assessments to thousands of pastors and churchgoers. His findings suggest church congregations are not a random sample of the general population but tend to cluster around specific temperaments, particularly what psychologists classify as Sensing and Judging (SJ) types — described as dutiful, orderly individuals who show up early and value structure.
The research examined churches within the same denomination that offered different service styles. "Sermon-first" churches emphasized Bible-centered, practical teaching with contemporary music, while "ritual-first" churches focused on ceremony, reverence, and traditional liturgy. Francis's team then compared the personality profiles of attendees at each style.
What the Left Is Saying
Progressive theologians and mainline Protestant leaders have largely welcomed the research as offering a framework for reducing denominational conflict. The Rev. Dr. Amanda Richards, a United Methodist Church official involved in recent denomination restructuring discussions, said such studies could help denominations "understand why we disagree rather than assuming bad faith."
"If people are wired differently from the start, it changes the conversation," Richards told Political Bytes. "Instead of 'you're wrong,' it becomes 'we experience worship differently.' That could be genuinely ecumenical." The United Methodist Church, which has faced significant internal tensions over LGBTQ inclusion and liturgical practice, has begun incorporating personality research into some denominational reconciliation efforts.
Some progressive Christian organizations argue this framework could advance their goals of interfaith cooperation. "If we understand that Catholic, Protestant, and Orthodox traditions appeal to different temperaments, we can build coalitions around shared values rather than fighting over worship style," said Marcus Williams, a spokesperson for the Christian Community Foundation, which funds ecumenical initiatives.
What the Right Is Saying
Conservative religious leaders express caution about the research's implications. Pastor David Chen of a Southern Baptist megachurch in Texas told Political Bytes: "My concern is that this could reduce faith to psychology. The Gospel calls us out of our natural preferences — that's the point."
Several evangelical scholars argue the research, while interesting, should not be overemphasized. Dr. James Patterson, a theologian at Southern Methodist University who has written on church growth strategy, noted: "People convert. Their Myers-Briggs type doesn't change when they come to faith. So personality may influence initial attraction to a tradition, but theology shapes the ultimate destination."
The research also raises questions for churches that emphasize conversion and sanctification as transformative experiences. "We're supposed to be remade in Christ's image," Chen said. "If we're just sorting people into denominations based on temperament, that's not evangelism — that's market segmentation."
What the Numbers Show
According to data cited in the research: 88% of Fortune 500 companies use Myers-Briggs Type Indicator assessments for employee evaluation and team-building purposes. Approximately two million individuals take the Myers-Briggs test annually.
In Francis's study, more than a quarter (26%) of American Catholic priests tested as ISTJ — the "Logistician" personality type characterized by practical, detail-oriented thinking and introversion. In comparison, approximately 16% (roughly one in six) of men in the general population share this profile.
The Sensing-Judging (SJ) temperament cluster comprises roughly 40-45% of the general U.S. population but appears overrepresented among regular church attendees across denominations, according to Francis's aggregate data spanning multiple studies from 1994 to 2024.
Church consultation services report that mid-sized congregations increasingly use personality assessments in leadership development: 67% of churches with attendance between 500-2,000 have utilized tools like StrengthsFinder or Enneagram testing for staff and small group organization, according to a 2025 survey by the Church Leadership Institute.
The Bottom Line
The research suggests that denominational affiliation — often cited as a source of significant Christian conflict — may have roots partially in psychological temperament rather than theology alone. This finding could reshape ecumenical dialogue if denominations view stylistic differences through a personality lens.
Churches face practical questions about how to apply this research. Should congregations design services to attract their natural demographic, or intentionally mix service styles to reach beyond personality preferences? Could understanding personality types reduce infighting over worship decisions?
Theological implications remain contested. Progressive churches may use the research to argue for greater tolerance between denominations. Conservative leaders counter that faith should transform personalities rather than merely accommodate them. Both sides agree more study is needed on whether personality influences theology or simply shapes initial denominational attraction.
Francis's work continues with longitudinal studies tracking whether personality types predict church attendance patterns over time, and whether congregations that intentionally diversify their service styles see broader demographic reach.