Clark's books include God and the Brain, Strangers, Neighbors, Friends, Religion and the Sciences of Origins, Abraham’s Children, Return to Reason, The Story of Ethics, When Faith Is Not Enough, and 101 Key Philosophical Terms of Their Importance for Theology, many of which have been translated into multiple languages. In 1995, his book Philosophers Who Believe was named one of Christianity Today’s Books of the Year. That book detailed the spiritual and intellectual autobiographies of philosophers such as Alvin Plantinga, Nicholas Wolterstorff, Basil Mitchell, Mortimer Adler, Richard Swinburne, Frederick Suppe, Linda Zagzebski, and Nicholas Rescher.
