OK, gotta put just one "2 cents" in,,,,,as far as this father/son/ghost thing....
and the Holy Spirit descended on him in bodily form like a dove. And a voice came from heaven: "You are my Son, whom I love; with you I am well pleased."
So,,,,,now, in my humble opine, dig it....
If you go with the all in one theory,,,seems he's sitting in the water, talking to/about himself, and sitting on his own shoulder...
Granted,,,,said "god" can do anything and all that, but, if you go by the teachngs the bible tosses, most things were taught to make us think, to make sense, and to be a way of learning.
So, if "god" wanted his peoples to percieve him/son/spirit all in one, why would "he" have had this pivital scene come accross as there being three seperate beings?
There are other scriptures that lead one to believe these are three seperate beings/entities:
Acts 2:4 All of them were filled with the Holy Spirit and began to speak in other tongues[a] as the Spirit enabled them.
Matthew 26:39 Going a little farther, he fell with his face to the ground and prayed, "My Father, if it is possible, may this cup be taken from me. Yet not as I will, but as you will."
Thats my thoughts on it,,and, if its any cosolation, my dear Mike is a believer of the all in one theory, with the explination of,"cause thats how it is".