I think regardless of whether there existed a Jew/Rabbi at the source of the Biblical account. Jesus did not write anything. Can't even be sure, if he existed, what he looked like.
What we have is a fictional character, not a real character. There is simply not enough information about Jesus for Jesus to be real character. Even the name Jesus is a fictional creation.
Are you ok with Jesus as fictional or do you feel a need to insist that Jesus existed as a real person?
It's okay if Jesus and God are fictional, as long as we're fictional too.
They say that God is infinite. Maybe we are just a little bit away from God (which would put us at infinity, too).
Maybe God was created with the big bang...if so, he existed in space of zero width, zero height, and zero depth (if you believe the old theories that said it was all crushed to a singularity). New theories cast doubt on this idea, claiming that some force (I suppose quantum forces) kept the universe from gravitational collapse before the big bang.
The bible says that God was the alpha (beginning) and the omega (end). If the two are the same, time didn't change for God. That would explain how God knows the future. But wouldn't that mean that the universe continues to expand until it wraps around in space-time and starts at the beginning? That would mean that the distant future of the universe is the beginning of the universe. If so, that would certainly explain what caused the big bang and where all of the matter in the universe came from.
The problem with that idea is that, as far as we know, nothing goes backwards in time.
Maybe we are all in an imaginary dimensions (or many imaginary dimensions)?
Philosophers have grappled with the idea that we don't exist. They call that branch of philosophy existentialism. When I was finishing up grad school in philosophy, getting an advanced degree, I grew to dislike that branch of philosophy....it made things so meaningless.
I switched to other disciplines of science and the arts, and got many more advanced college degrees.