Without scientists, there can be no science. The same goes for religion, right? Without priests there is no God. Hence the reason we no longer believe that Thor is travelling across the sky when there's a thunderstorm or Hades is there to welcome us across the river Styx when we die. Nobody really believe in those gods any more, and so they don't exist. The only reason the Christian God still exist, I would infer, is because there are still those whom believe in him.
Oooooh, I shall make this line of thinking a part of my gastly story. He he...