In your opinion what causes christians to believe in Jesus

[Sheldon]

For me it would be meaningless to talk of probability, when one has no objective evidence of possibility. 

What does objective evidence of possibility mean?

Which word is tripping you up? 

Say, for example, we erase every elephant from the planet, and all the evidence of elephants along with it. Clearly, elephants don't become impossible as a result, so what "objective evidence of possibility" do we look for for elephants?

A bizarre and pointless analogy, just offer the best evidence you think you have for believing a deity exists or is possible. You seem to be tap dancing around this rather simple question, who knows why.