The infamy mechanic has been added as of Patch 2.5.1. It's supposed to work in a similar way to aggressive expansion in EU4, where by conquering provinces will contribute towards your infamy score which is represented by a percentage. If that score reaches 25% your neighbours will start to form coalitions against you.
But does anyone know whether Crusades or Holy wars will contribute to this infamy score?
If say, I'm France and a Crusade is called for Jerusalem and I'm the largest contributor therefore gaining all the provinces in the Kingdom of Jerusalem. Will all my Christian neighbours who also fought alongside me suddenly form a coalition against me because gaining all those provinces blew my infamy score sky high?
Or say I'm Castille and I start a Holy War for the Algarve. Is infamy constrained by Religion Group or will a Holy war against a different religion group increase my infamy also?
I've searched for some documentation on how the infamy mechanic is supposed to work but can't find any real explanation.