The catholic system sounds really bad. Like it'll be really annoying having to constantly guess what amount of influence you want. It might be realistic, but it just seems bad. The eu3 system with all the expansions seemed pretty good.
Oh well, probably easy to mod.
and oh dear... only bonuses on extreme ends... there's a reason magi mundi did everything to attempt to make the middle ground with sliders a decent option. This is gonna be, as soon as you decide you want max piety you're gonna feel like your bonuses are gradually disappearing before you start getting the ones you want. The middle ground isn't going to be interesting it's just going to be damn tedious. Not impressed.
Also, with muslims having piety, all I'm going to be thinking is, this is nice and all, but was the piety of the ruler really that irrelevent to christians? Even if it was 1/2 or 1/3 as relevent if it was at all it should be giving bonuses or maluses that affect things.
Apart from the orthadox one which sounds good, all the features presented hear seem sortof tedious, like manually sending merchants before NA.