In your opinion what causes christians to believe in Jesus

[AFTT47]

1. Being indoctrinated and 2. It is very natural to just see the world and say "this cannot all just make itself from nothing"

Gotta disagree on point #2.

If one finds it very natural to just see the world and say "this cannot all just make itself from nothing," than how can they reconcile that belief with an even greater thing (God) somehow existing without a creator?

There is no escape from the "First Cause" problem. This is a case of us not knowing. Isn't it more plausible to admit that we (at least currently) have limitations in either or both knowledge and intelligence which prevent us from solving this problem than pulling an answer (God) out of our stupid and/or ignorant ass?

God does NOT solve the "First Cause" problem. Nothing we can come up with does.

Socrates supposedly said, "The only true wisdom is knowing that we know nothing." It might not apply universally but it definitely applies here. We don't know how we ultimately got here. Sometimes, "I don't know," is the smartest, wisest thing we can say.