There's a game by the name "Cult", an old, very low-fi indie game. The lone developer was Israeli, that's all I remember. The game is set up as you being an investigator infiltrating a cult building and trying to resolve a hostage situation... or some such.
The Dead Space trilogy involved a cult as a major plot element (a very unsubtle satire on Scientology).
Come to think of it, cults sound like a very common horror trope.