In your opinion what causes christians to believe in Jesus

[Angrboda]

Beliefs aren't simply isolated bits of information that one agrees with. They are integrated and predictive mental models of the world.

And so, why do Christians believe in Jesus? For the same reasons anybody believes anything: Because the proposition integrates well within their broader web of beliefs and reduces it's entropy. In other words, because it makes sense to them.

There's a grain of truth to this, but it's also the case many times that the cart leads the horse, with the belief and its justification co-evolving with each other.