I don't think the biggest religion on Earth would be based around a guy so flimsy he would reverse all of his beliefs when facing one more trial. I reckon he would just sigh really deeply and try to save another world.

I'm not saying it can't be Jesus, but I don't see the point of it. The Japanese anime studios (and mangaka) are obsessed with evil Christian priests, so making Jesus the boss of the villains would certainly fit their tastes.