 What both Prefaces ultimately explain is that Kant’s goal in the Religion is to (a) provide an inquiry into the scope of overlap between historical faith (especially in the form of Christianity) and pure rational religion; and (b) use the latter as a guide for distinguishing between which elements of the former are matters of “genuine religion” rather than “cult” (AK 6:12–13). Each of the Religion’s four parts then take on core issues with Christian doctrine.