Well, I,m rather new at this game so I didn't figgure out some of the things, for example the bonusses and disadvantages of the religion you are playing with. I only know that when you're catholic you receive more gold and piety, but nothing more... :confused:
so?
if you want to know the diference, it is the best to play as othe religions.
F.i. muslims have remarkable morale bonus, orthodox independent books bonus, orthodox dependent gold bonus, but morale penalty, pagans cannot have clerics etc. there are many difenences and it makes your games little different (less than it shuold IMO)