In your opinion what causes christians to believe in Jesus

[Sheldon]

Right; and the majority of Christians don't hold any strong beliefs about what God is beyond his role as creator. In much the same way that the majority of people don't have any beliefs about the workings of human perception, they just know they have eyes and that they see. And any belief they did have is guaranteed to be wrong. You have to go to experts who have at least attempted to come up with reasonable answers to the question.

I remember meeting a Christian couple here in Hiroshima -- he was from Hiroshima and she was from Nagasaki. They were both doctors who had spent the majority of their careers doing charity work. He was a founding member of an anti-nuke organization that won the Nobel Peace Prize. 

I asked them about their theological beliefs and they said they had never thought about it. It was the least important part of Christianity in their eyes.

So I suspect this is true of the majority. And it's the reason why trying to dissuade them from Christianity by asking for objective evidence of a prime mover -- or something like that -- is a niche hobby for people on line, but doesn't make much difference in their lives.

That's a hasty generalisation fallacy, also never thinking about a belief, is hardly a compelling argument it has any merit. Now I can't speak for anyone else, but I am not asking for objective evidence for the benefit of believers. Who claimed that debating theistic claims made a difference to the lives of believers? In case you failed to notice John sought out an atheist forum to peddle his superstitious wares, I don't go to church and sneer like that, and when others try to proselytise me in the flesh, they get a very polite no thank you, initially.