1) Religions map to highly differentiated belief clusters and mentalities that have little to do with their theologies, 2) Heresies are separatist movements, often ethnic, and have little to do with religious doctrine. — “This city,” [Constantinople] says he [Gregory of Nyssa], “is full of mechanics and slaves, who are all of them profound theologians; and preach in the shops, and in the streets. If you desire a man to change a piece of silver, he informs you, wherein the Son differs from the…