What if any is the benefit of having good relation with certain religions? Like when you donate money and get a +5 with which ever religion. Would be cool if you got a unique weapon eg. 100 relation with R'hllor you would get the flaming sword.
Would be good enough if it allowed you to hire religious units, there's a bonus in healing skills granted by having x amount of them in your party, and the Red Priests upgrade into some nice Horse Archer units.