Where does the conceptualization of the Holy Trinity come from? Take this quote for instance:
"27 My sheep hear My voice, and I know them, and they follow Me. 28 And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand. 29 My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of My Father’s hand. 30 I and My Father are one."
It is meant metaphorically, far as I can tell. There is no literal connection there that outright states "Jesus is God incarnate". It says he's a shepherd, like unto God, nothing else.
This is, far as I know, the basis of the claim that Jesus is actually God. But I confess that I haven't studied the scriptures rigorously, and I would like to pass this idea around. Also, where does the Holy Ghost thing originate from?