Dryhads orignal event modcomp did this: when your civ gets its fifth religion, a randomly chosen religion goes obsolete. My changes improved it so that the religion is only eliminated from the civ concerned rather than worldwide, and so that by paying 200 gold, you can stave this off any number of times for another turn, during which a different religion may be chosen to go away, until you can lose the religion you select by not subsidizing it. Your state religion is exempt.
