In your opinion what causes christians to believe in Jesus

[Sheldon]

Please demonstrate it is possible then? 

How does one prove possibility? 

You don't know how to demonstrate that what you believe is true, is even possible? Have a little think about what you just said. 

The best I can do is point out that the idea is conceivable, 

Like unicorns and mermaids then, and all the countless deities humans have imagined that you don't believe exist, again I can only suggest you try and think about your assertion. 

and not internally incoherent or contradictory. 

 Your assertions have been both incoherent (contradicting word definitions) and contradictory, you claim something is possible because we can conceive it. I can conceive that the earth is flat, and am now starting to wonder if you know what conceive means? 

That's why I began by saying the conversation is pointless if you aren't already open to the possibility. 

Yes, because you don't seem to understand what possible means, I'd offer the dictionary definition, but alas I tire of handwaving responses. 

That seems to be the bare minimum when exploring any new idea in earnest, don't you think?

What, presupposing it is possible? Absolutely not, possibility has to be demonstrated, obviously. 

What is your criteria for disbelief? I think this is now an essential answer you must provide.