You are confusing reasons with proof. Most believe because they choose to. Because believing in God gives them meaning and purpose, and a drive to be better, to do better. And because they have had personal experiences that lead them towards belief.
The proof for them is in the effects that faith has had on them. “By their fruits” and all that. Not far different to the “proofs” of dark matter.
Though it’s very ironic that you stereotype people of faith, and think I’m the one who needs to meet more of them.