It's been done several times...Lord Olleus said:would it be possible to maje the game so that we don't know in advance what techs unlock religion. So every time a new tech is discovered by someone there is x chance of a new religion being founded (maybe 'religious' techs could have 2x chance to make them better). Because if you think about it a king can t just decide to invent a new religion, its much more random.