In your opinion what causes christians to believe in Jesus

[Sheldon]

I've got one. Why is anyone still giving Johnny attention?

Because people feel they are defeating and humiliating him, and they enjoy doing this and then gloating about it.

I doubt his ego would allow him to register this as humiliation, like you he clearly is utterly convinced of his intellectual superiority, you both never shy away from pointing it out, and how do you defeat a blind belief exactly? As for enjoying gloating, you have it exactly backwards there.