Let's take "evolutionary theory." As far as I'm concerned, the only thing that matters is when science gets to the point when it can turn one species into another. Then it's proved beyond all doubt.
And, again, as far as I'm concerned, Richard Dawkins and Stephen Jay Gould have completely wasted their lives. They were/are not scientists. What they engaged in is mental masturbation.
I've mentioned before that I knew the late James P. Hogan, a science-fiction and science-fact writer. He wrote that all science automatically turns itself into technology. The proof is in the pudding. All the meaningless arguments are just that...meaningless.
I understand why people believe when there is no proof. Some people cannot tolerate not knowing, so they will engage in whatever mental gyration necessary to convince themselves what they believe is true.
Vifredo Pareto put it this way: "Men follow their sentiments and their self-interest, but it pleases them to imagine that they follow reason. And so they look for, and always find, some theory which, a posteriori, makes their actions appear to be logical. If that theory could be demolished scientifically, the only result would be that another theory would be substituted for the first one, and for the same purpose."
Many people start out believing something and then look for proof.