Christian Polytheism

[abaris]

From what I've heard, the bible doesn't even talk about the three being one. Jesus certainly doesn't act like he's the same guy as Yahweh.

Yes, Jesus doesn't act the part. If they were one, he would constantly refer to himself in third person, he would beg himself to take this cup away from him and ultimately he would sacrifice himself to himself.

That's why I call it personality disorder, since you are taught to believe that they are one. My best guess as to the origins is, that trinity deities were prominent in ancient politheism and like so much else in christianity, they simply took a known concept and tagged their own meaning on it.