Paradox Interactive released a new expansion for Crusader Kings II called "The Old Gods" where you can now play as pagans and have a unique game. You can also send missionaries to the pagan lands, though they'll probably die, but the pagans could also convert.
The pagans can have female clergy as well, which has opened up a really odd, and wrong possibility. If you are playing as a pagan, and convert to Orthodoxy, and have your female priestess convert as well, she will become an Orthodox "Bishop" in the game... ... I'm hoping they patch that out soon.