Just watch Get Out. It has a basis in reality. The Kardashian witches have been trying to reprogram his brain. That is why one day he will be speaking blasphemy and calling himself Yeezus, and the next week preaching the gospel word for word, then the next week doing things full of occult imagery again.

Maybe not....but something is going on with him. It's like he gets possessed, then "cleans his house", and then the demon returns bringing 7 more of their stronger friends to reclaim the "house" again.