I see. Well at least relations between Protestant and Catholic civs should seriously worsen. Also, Protestant civs should be excluded from voting if the Apostolic Palace is Catholic owned (and vice versa). BTW, playing at Vice-Roy level, my Dutch civ could easily persuade Catholic France to change to Protestantism (Paris has the protestant Holy City). A cash bonus is nice (hadn't noticed), but I'm not sure that covers the Reformation (and Counter-Reformation!) entirely. For instance, the Netherlands might never have revolted against Spain if there hadn't been a sizeable Protestant faction and Spain's Philip II hadn't come down so hard on these 'heretics' - resulting ultimately in the 80 Years War and Dutch independence. Also, the 30 Years wreaked havoc throughout Germany, while involving several neigbouring countries (Austrian Habsburg, Bavaria in the Empire and Denmark, Sweden from outside were actively involved, as were France and Holland to a lesser degree); it practically tore the empire in two until a solution was reached by compromise. So, at any rate it should seriously destabilize the HRE in one way or another.