In theory, and potentially, a Jihad *can* pass through christian lands without causing warfare. At least I think I recall allowing Jihads to pass when playing a christian (usually Byzantium). And crusades when playing a muslim, as well, I think...

anyone else think that Crusading should be easier, but instead of giving you the lands, there should be at least a chance for them to drop into a "Crusaders" faction? They would be sort of like the rebels (but more organized), and would represent in a lump all the different orders, kingdoms, and fiefs, that were born in the taken lands.