Annunaki in GURPS Arabian Nights

[johndallman]

Originally Posted by b-dog

What if there was an alternate worlds sort of thing where there is one world where the Sumerian gods are real and another where the Islamic version is real and also another where the Babylonian version is real and so on. Somehow all of these worlds and cosmologies merged into one world and then all of the gods and there cosmologies are real but Islam is dominant as the other religions are old.

You really need to read the Madness Dossier sourcebook. Your idea is quite close to its premise, and it develops it in a lot of detail. It's a modern-day setting, but many of the ideas will translate.