Despite having been a believer until age ~14 or so (raised that way) I've been having real trouble lately getting into the heads of adults who really, actually believe all the stuff their religions teach. I don't mean the vaguely spiritual Unitarian Universalist sorts or the new-age Buddhists who figure all the weird stuff in Buddhist teachings & writings is purely allegorical, I mean the ones who truly think all the stuff in their books happened and maybe even that the supernatural has a real influence on their lives today.
I have even more trouble modeling the mind of functioning, even intelligent adults who run religious institutions and are true believers, not just pragmatists following along because that's What One Does, doing it all with a bit of a wink and a nod. Like, your average priest: how many actually believe? Is it really most of them? An abbott? Really, they do, for the most part? How about back in, say, the middle ages, the cardinals and such really believed? Nobles and heads of state did? I just can't wrap my head around it.
Or, ancient folks. How real was religion in their lives? To what degree were the gods of Greece a vehicle for conveying (this part clearly real and important, to the Greeks!) common norms and lessons via (essentially) folk tales, and how much did they actually think Zeus—actually Zeus, a supernatural being who for-real did all the batshit crazy stuff in the stories—truly might show up at their door dressed as a beggar? Did most people believe it? Did the elites? It's hard for me to imagine.
All this seems incredibly dumb, I know, but that's where I'm at.
[EDIT] incredibly dumb that I'm struggling so much to comprehend this, I mean.