Thank you for the reminder, but that's OP's point too, isn't it? Our native setting doesn't have real witches and magic and very tangible, very real, and very much malevolent demon monsters. So what the fuck else could it have been besides another ideological, sectarian bloodletting in a long line of the same, hiding behind doctrine like it always does?
The whole premise of OP's post is that "in marvel!" they could very well have been genuine in the style we're familiar with from pop culture, as opposed to the mundane reality of assholes killing people to feel good and important while other assholes make money off of it.
Comparisons to reality make me even more glad we have fantasy.