In your opinion what causes christians to believe in Jesus

[Sheldon]

So are we ever going to get one of John's many good reasons, as to why his faith in (some versions of a Christian) deity is justified?

I've told you no several times. This is where the road ends if we can't progress past possibility.

You have progressed past it, that's clear from your claim to have "many good reasons" for faith that a deity exists. Just give us one, and then we can decide how compelling we find it. 

Unless you are saying your faith only works, if you presuppose a deity is possible without any objective evidence, if so then fine. It's just I can't ever remember an apologist throwing the towel in so completely, and at the very first hurdle.