The Geislerian Argument for God: An Exploration of Norman L. Geisler’s Thomistic Metaphysical Argument for the Existence of God (Arlington, TX: Bastion Books, 2026).
Christopher co-wrote Chapter 2 (“What is the relationship between reason and faith?”) for: The Comprehensive Guide to Science and Faith (2021)
Christopher wrote Chapter 66 (“What is Panentheism and its Fatal Flaw?”) for The Comprehensive Guide to Apologetics (2022)
Christopher contributed two chapters to Farnell, ed. Vital Issues in the Inerrancy Debate (Wipf&Stock, 2016).
Christopher compiled, edited, and published Explaining Biblical Inerrancy (Arlington, TX: Bastion Books, 2013)
Christopher wrote most of How to Know God (Bastion Books, 2011)
