Religious curses are so interesting because they reflect world-building more accurately that the other types of swears do.

So when Patrick Rothfuss’s character says “Shit in God’s beard,” you know beards are important to the culture of the guy who is swearing, and when N.K. Jemisin has one of her characters, a god, say “gods,” in a moment of frustration, a reader learns something about this world: there is more than one god, for example, and this particular god probably prays to a god higher than herself.

Swearing is about taking the name of something important in vain. You can learn a lot about a culture’s values by looking at the things it considers to be obscene.

That’s the best kind of (expletive deleted) world-building there is.