In your opinion what causes christians to believe in Jesus

[Sheldon]

Look at it this way: conspiracy theories are based on false data and one can show someone who was duped that he has wrong facts, but he will mostly not let his belief in that conspiracy. That is because he has also made a whole world in his head based on the false data that excites him. So if you show him that only a weather balloon crashed in Roswell, he won't believe you because he already has a whole fantasy world of aliens secretly visiting Earth and giving people messages and whatnot, which has turned into a hobby and a passion project.

The problem with conspiracy theories isn't faulty information it's faulty information processing. It's the reasoning patterns used to reach conclusions, and not the accuracy of the facts, that's problematic. That why, as you said, the problem doesn't really go away if you just throw facts at people. And that's why you can find conspiracy theories within religious circles (i.e. the jesuits are infiltrating protestant churches) and within secular circles (i.e. the government faked the moon landing).

The problem with conspiracy theories, is they are lapped up without sufficient, and sufficiently objective evidence. Not unlike religion of course.