The phenomenon in which a work of Science Fiction or Fantasy has only one religion (The Church) in it; furthermore, there are never any factions of it, or different interpretations of its belief. This is related to Law of Conservation of Detail. The lack of other faiths doesn't particularly break Willing Suspension of Disbelief, so why bother? Having said that, it's inherently unrealistic; our planet has seven or ten major religions in the modern day alone (some founded individually and others spun off from existing ones), and other religions have come to prominence and since died out. But no one ever questions this when it happens, making it either an Acceptable Break From Reality or something too controversial to touch with a ten-foot pole. It is most justified in works where much more i