So, I like to watch some of the paranormal shows involving ghosts, demons and other good 'ol occult paraphernalia where they document various accounts from actual people. I've noticed in the episodes involving demonic attacks, one of the phrases that always seems to get dropped is, "God can't save you now."
I thought about it a bit, and I think it'd be much more horrifying if they'd say something more along the lines of, "God won't save you now." There'd be less of an attempt to brag about their own power, and it would produce a stronger feeling of despair. It's not their god doesn't have the power to stop the demon, but rather, it just doesn't care enough to do so.
But, then again, I'm not a demon. I don't tell them how to torment humans. And they don't tell me how to write ridiculous creepypasta.