Biblical Studies: Books in this subfield examine the Bible and its interpretation, and may explore topics such as biblical archaeology, the historical context of the Bible, and the role of the Bible in shaping religious and cultural beliefs. Examples include "The Bible as History" by Werner Keller, "The Bible with Sources Revealed" by Richard Elliott Friedman, and "How to Read the Bible" by James Kugel.

Religious Memoirs: Books in this subfield are personal accounts of individuals' religious experiences and journeys, and may explore topics such as faith, doubt, conversion, and spiritual growth. Examples include "The Confessions" by St. Augustine, "The Autobiography of a Yogi" by Paramahansa Yogananda, and "Eat, Pray, Love" by Elizabeth Gilbert.