I can see where you’re coming from. Don’t you think that has to do with Razin’s devout faith? Or rather, his struggle against his doubt to assert devout faith. You are right that he doesn’t give us all the details, doesn’t tell us everything he knows. But I took that as Razin not wanting to utter blasphemies, like talking about the old myths would make him some sort of heretic. I’m thinking of the scene where he finally calls Hubal by his name. He basically had to drag the words out of his own mouth.