‘John’s gospel comes to the Jesus story from its own developed perspective’ - so do the other gospels. All you are saying is that you have access to some other information (which you do not disclose) which disproves this perspective.

‘God is what anyone or any group finds to be of most significance’ - this is a contradiction in terms: if God is no more than people’s projections of him, by definition, he ceases to be. The statement also contradicts your immediately preceding statement: if that is your definition of God, then it is precisely trying ‘to God him from below’. Find some other word or concept: ‘God’ won’t do.

‘The Bible is not trinitarian’ - more to the point, the bible is not monotheistic - in the sense of presenting a unitary God who lives in solitary isolation. It would be much simpler if he were, but that is not how he is presented. That is more a product of Greek philosophical thinking. There is plenty of evidence that this is not how Jews saw him, and neither Old nor New Testament present him in this way. It certainly was not how Paul saw him - but I have a feeling that Paul, like the four gospels, is excluded from your personal biblical canon.