What about them?
If they did not have any religions organized by human beings what of them? Was their world diverging and falling as you say?
Mankind has been on this planet for at least tens of thousands of years, despite the idiocy of some who deny any science whatsoever.
Organized religion as we know it today has been around for only but a blip on the radar screen. Chances are, we will be around for many many more years in our present form.