“But,” you say, “it’s a supernatural horror story. How can an atheist see something like that and not sneer at it?”
Easy. It’s a movie. I believe that movies actually exist. I also enjoy some superhero movies in spite of the fact that they postulate huge violations of the laws of physics, chemistry, and biology. I like movies that tell me something about the human condition, and big budget spectacle is a distraction from the story at the core.