Yes, this seems right.

A priori, with no other evidence one way or another, a belief held by human beings is more likely to be true than not. If Ann says she had a sandwich for lunch, then her words are evidence that she actually had a sandwich for lunch.

Of course, we have external reason to doubt lots of things that human beings claim and believe, including religions. And a religion does not become twice as credible if it has twice as many adherents. Right now I believe we have good reason to reject (at least some of) the tenets of all religious traditions.

But it does make some sense to give some marginal privilege or respect to an idea based on the fact that somebody believes it, and to give the idea more credit if it's very durable over time, or if particularly clever people believe it. If it were any subject but religion -- if it were science, for instance -- this would be an obvious point. Scientific beliefs have often been wrong, but you'll be best off giving higher priors to hypotheses believed by scientists than to other conceivable hypotheses.