We are all part of a slowly-progressing nightmare inside the mind of a sleeping god. The moment the god is awakened, we'll be gone.
I suspect someone somewhere already holds a patent on this. As soon as I try to turn this into a book or a movie or a belief system, lawsuits will start flying.
But if I were a tribal leader of 20 people in an isolated jungle, I'd totally turn that into a myth and create a religion around it. And the job of believers is to cause enough terror inside this nightmare to jolt the god awake.
I guess that makes my religion a doomsday cult. Specifically, an activist doomsday cult.