Historical Jesus is really interesting to me and stuff like how John The Baptist...baptized historical Jesus into something. So probably, Jesus was an acolyte of John The Baptist who went off and founded his own, similar movement. But then early Christians didn't like the implications of their main guy being a spinoff so these weird interpretations like John himself saying at the time 'I don't deserve to do this baptism, but I'm going to anyway for some reason and this other guy is the main guy and also in one gospel I'm Jesus' cousin.'
And also then Jesus' brother James the Just running the church after Jesus and there's a non-canonocal gospel (Thomas I think) that says 'James, for whom the Earth and Sky came into being' or something like that. And Jude calls himself Jude, brother of James. But James is the brother of Jesus so probably he is also the brother of Jesus, but that isn't the most relevant thing about Jude. So what an interesting alt-history you could write where Paul doesn't exist and James' church wins out and he's...also co-God? Or Jesus gets demoted and they're both just Mohammad-style brother prophets?
Oh boy. Here I go theorizin' again.