Religious horror is a subgenre that takes psychological, supernatural, and bodily horror aspects amongst others and combines them into a unique story. There are also major historical aspects that have the potential to be incorporated as well. It is a very popular movie genre, but unfortunately there aren't many video games in this genre. Outlast 2, FAITH, etc. There's only a handful. As a community, we can expand this genre, even if only by a small margin. 

Make a game! You could make it about a cult or a coven. You can make it about demons and vampires. You can make it about real world religions and incorporate your own personal experiences. Do what you want! Go crazy! It's the perfect genre to do so in. 

Rules: The horror aspect has to be tied to a religious aspect. That's it. Other than that, do whatever you want as long as it doesn't break any site rules.