That's not the case at all. In The Stand, both God and evil are very real and there are very few committed believers.
A couple of instances that I can think of where God shows his existence: 1) He responds to Mother Abigail's prayers to drive away the weasels that were attacking her and 2) showing Mother Abigail where the people should congregate. None of the characters in the story knew it, but Boulder was the one city that had been pretty much cleared of people, so there weren't the problems there associated with tons of dead people lying around. When the plague was spreading, there was a panic spread that it may be caused by some nearby government facility and the bulk of the people fled from that area.
I didn’t mean to imply there wasn’t evil depicted in the story. How could anyone watch the movie and miss the evil?