While primarily focused on ancient Greece, Fox has written three books dealing with the history of Christianity, Pagans and Christians, The Unauthorized Version: Truth and Fiction in the Bible, and a biography of Saint Augustine, Augustine: Conversions and Confessions,[21] which was awarded the Wolfson History Prize. In the second book, Fox professes himself to be a non-believer, although in the last book he expresses much admiration for St. Augustine.