Why do Christians become Christians?

[Angrboda]

I believe, especially for an adult not raised in a Christian home, it is the appeal of Jesus as a person coupled with his teachings that draws people. Why do these things resonate with a large number of people? 

The bulk of conversions occur between the ages of 4 and 14. For those who don't get it young from family, it isn't a "large number" of people that convert. Perhaps in Africa the situation is different, but there I suspect the church's draw as a social and community center is the drawing factor, not Jesus.

It is obvious that we are somehow wired to believe in God/higher power/supernatural/purpose/destiny etc. Of course you will say this is a product of our evolution. There are several theories centered around the adaptive values of religion (social solidarity for one). However, these theories presuppose naturalism. So the result of this reasoning is that if God did exist or did not exist, we would still be wired to believe God exists.

We are wired to make socializing with invisible minds a natural skill. It's a mere side effect of these social cognitions that we have the concepts of disembodied minds like ghosts, spirits, souls, and gods. That we are wired in a way which makes god belief natural doesn't say anything one way or another about the practical truth of such beliefs. It may just be an unfortunate side effect. I'd say we are more wired for religion than any particular one, and that doesn't bode well for you attributing it to the strength of the character of Jesus. Religions come and go. The ascendancy of Christ centered religion is possibly more historical accident than any sign of inherent fitness.