I do think, however, that Marvel and the rest of the comic book worlds don’t do enough to portray the societal change that would come from having superheroes, with religions being one of the most strongly affected. The existence of those heroes— and villains— would have to become one of the dominant theological problems, especially in that some of them claim to be acting in the name of (various) gods, let alone the ones who claim to be gods. There are beings who certainly look like and claim to be angels and demons, as well, from various pantheons.

While I don’t think this would lead to an increase in atheism, the complete incoherence of the supernatural system in those worlds would change all theology profoundly, and while some fundamentalist religions might handle it with “They’re all tools of the devil”, that would be very fragile, like all such declarations.