Is it possible for there to be a situation in which there are two religions from the same source, each worshiping a certain deity while considering the deity the other religion worships to literally be the source of evil? Maybe a schism between two prophets?
No, Satanism doesn't really count, it's always been a bunch of atheists trolling Christians.
No, Satanism doesn't really count, it's always been a bunch of atheists trolling Christians.