Culture is important to us, of course. Even an uncultured boor such as I know that. But why?
Culture is a sort of security blanket. It gives comfort and meaning, helps us to make some sense out of what is a confused and impossibly complex range of sensory input. It helps us, you might say, to give some structure, some order and meaning, to a universe that in fact really doesn't have any!
But I think that cultures adapt religious thought (rather than religion subsuming cultures) because ultimately it is the culture, not the religion, which is important. And why should this be? Probably for the very simple reason that the great majority recognize that religion is merely a formalized mythology, trying to explain the culture in terms that everyone can understand.
