In this first episode of the Unorthodoxy podcast, I offer a few reflections on the tricky distinction between orthodoxy and heresy in Christian theology. Books referred to in this episode include: Atheism in Christianity by Ernst Bloch, Did Calvin Kill Servetus? by Stanford Rives, The Soul of Doubt by Dominic Erdozain, Heresy: It's Utility and Morality by Charles Bradlaugh, Heretics by GK Chesterton, and The First Apology by Justin Martyr.