In your opinion what causes christians to believe in Jesus

[John 6IX Breezy]

They become evidence when a human being interprets them in support of a conclusion. Then the interpretation of the fact may be used to increase the credibility of a proposition -- which is what evidence does.

Precisely, if evidence does anything at all, it seeks to increase the credibility of a proposition. It can justify your beliefs, irrespective of whether they are true or false. (Curiously, the whole endeavor is almost meaningless unless there's a social context to it; it's as if the goal of evidence is exclusively persuasion—evidence is good to the extent that it can persuade others of the belief.)