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John is a faculty affiliate of The Human Flourishing Program at Harvard University's Institute for Quantitative Social Science. He is the former Research and Program Coordinator for the Biola University Center for Christian Thought and teaches part-time in the Department of Philosophy at Talbot School of Theology.  A former pastor, he holds a Ph.D. degree from The Cook School of Intercultural Studies. His dissertation focused on deconversion from Christianity to atheism.


He is the author of five books on deconversion, A Recipe For Disaster: How the Church Contributes to the Deconversion Crisis (Wipf & Stock, 2018), The Anatomy of Deconversion: Keys to a Lifelong Faith in a Culture Abandoning Christianity (ACUP, 2021), Going... Going... Gone..! Why Believers Lose Their Faith and What Can be Done to Guard Against it (Renaissance Publishers, 2020), Before You Go: Uncovering Hidden Factors in Faith Loss (Leafwood Publishers, 2022), and Set Adrift: Deconstructing What You Believe Without Sinking Your Faith (Zondervan, 2023). John is also a contributor to an updated edition of the forthcoming book Apologetics for a New Generation (Harvest House 2025). His sixth book, The Good Book? Restoring Your Faith in the Bible by Questioning Everything You Assume About it, (Tyndale) is due for release in 2024.

John is the Director of Cultural Engagement with the Renaissance Forum which focuses on connecting calling to culture for societal wellbeing. He enjoys speaking at churches and conferences on topics related to biblical studies, philosophy of religion, deconversion, and the relationship between the Church and culture.

Dr. Marriott is also the International Student Services Coordinator at Whittier Christian High School, in Whittier California. 

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I have three main areas of interest and research: the sociology of religion, (specifically the phenomenon of deconversion from Christianity to atheism) the relationship between Christianity and culture, and to a lesser extent the philosophy of religion. Most of my time is spent thinking about deconversion, or the loss of religious faith. It is my hope that my research into deconversion can help two groups within the Christian Church engage with the phenomenon of deconversion in a meaningful way.

First, I hope that my work will aid parents and church leaders to understand why people abandon the Christian faith. Some of the problems are of our own making. Surprisingly, a certain sort of apologetics may even contribute to deconversion. Second, I would like to be a resource for and aid to those who are within the Church but are wrestling with retaining their faith. Belief in Jesus in the 21st century is not easy. I understand the doubts and misgivings that believing in Jesus can give rise to because they often exist in me as well. Too often the Church has offered simple answers to deep, complicated and troubling questions. I would like to counter that by engaging in meaningful, honest dialogue about the Christian faith.

Above all, I seek to honor Jesus through my research. It is my hope that in all things I will represent him well, by being clothed in humility, grace, and respect for others.



"Dr. John Marriott is a leading authority on the topic of deconversion.  His research has enabled him to get inside the minds of people who have experienced deconversion and those who have struggled with it.  If you are working with people struggling with deconversion or walking through this journey yourself, you will find Dr. Marriott's resources very helpful."
Dr. Todd Hall
Director, Institute for Research on Psychology and Spirituality
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