Quote Originally Posted by Ciaran
It´s a good idea though, you can even lift excommunitation if you have Crusade markers to spare.
Once I, as HRE, was excommunicated for waging war against the French. Then the Pope called for a Crusade, I took and finished it and was back in the loving embrace of the Church. And the French got excommunicated
However, I don´t know whether that works only with called-for crusades or crusades in general.

By the way, you can also check province loyality in the income screen.
Well, this was news to me I rearely get excommed and if I do I kill the Pope on the next possible occassion but it is good to know that if crusade is called upon you can get recommed (is there a word...?)

However I am quite sure that just starting any crusade does not revoke excom. One of the problems (of many) about excommunication that the Pope forbids you to start a crusade and I think also the alliance with the Papacy (if exists) is dissolved (of course if you attacked the Papacy you are at war, but if you are excommed for attacking another Catholic nation you are back to neutral from allied)