Dirty Penguin
Master Of Ceremony
Follow it through and it's fairly obvious you're stuck with it:-
Start with "God the Father", all nice and Abrahamic, alone, jealous and prepared to flatten all comers. The he sends Jesus, so we have two parts, clearly separate or we just nailed the only true god to a cross, and he called out to himself for help. Stopping there would be nice and simple, but Jesus is reported as saying that you can slag off God; no problem, you can be rude to Jesus; shrug, but if you say anything bad about the Holy Spirit your stuffed and no takebacks. QED the Holy Spirit must also exist, isn't God or Jesus but is in some way more terrible than the pair combined.
Now if in the beginning there was one god, and by the end of John we have three it's a conundrum, but if we say they're all really the same thing, stop asking questions, I'm not listening, la la la, we might just get away with it.
simples.
Anyhow, Jesus said he was the 'Son of Man' not the son of God, so he may not really be God anyway.
The biblical Yeshua is not part of a trinity. In his prayer he begged his god to make his followers one in purpose as they (he and his god were). He clearly, while on earth, said he had a god..and even after his ascension (all of this according to the bible) while in heaven says he has a god.