Your train of thought seems a little bit scattered. I'll try and follow along as I respond.
- In order to prove the non-existence of a god, you have to rule out not only all possible places it could be, but all possible things it could be. The study of what something is is called ontology, and the ontology of even the Christian god is terribly vague.
- The idea that the real god might not be the Christian one is the best response to Pascal's Wager. Well done coming up with it yourself.
- There is no available physical evidence for any of the figures or events you mention, only documentation in the form of the Bible and some other writings. That's why these texts are defended so aggressively. They're the last and only line of defence for Christianity, and Judaism too.
- When the gospels were written is no more settled than who wrote the things. As the link explains, Christian scholars tend towards a range of dates in the middle of the first century (20-30 years after the apparent crucifixion), while others think it was closer to the end of that century (30-60 years after).
- The God is Imaginary website doesn't really prove that God is imaginary. It does have some very clever arguments which turn scripture against itself and portray certain beliefs as very silly indeed. It's become infamous enough that evangelists have posted direct responses. This guy has written fifty proofs God is real to counter the site's fifty "proofs" God is imaginary. Not one of his is a real proof either.