In your opinion what causes christians to believe in Jesus

[Angrboda]

I can see both sides. Take the example of a unicorn. If one is going by a strict definition of a creature that has all the attributes of the mythical animal, a white, single-horned, horse-like creature that can only be captured by a virgin, then the odds of such are fairly slim. On the other hand, if one means a single horned quadruped that is similar enough to the legend to have given rise to the legend, then the possibilities are broader. So it really depends on whether you mean a head that is a literal plastic beach ball, or a head that only resembles a beach ball.