I had a perfect relation to the papal states (it was actually "perfect") and I had all crosses (except for maybe one - shortly said I was the papal states' pet.

I thought of asking for a crusade against a rebel settlement since I had very good reltions with Egypt and the Turks. I never got that far since the pope called out a crusade against Jerusalem, held by Egypt. I see this as my chance to expand, and I want to be even better off with the pope, so I join, just like as good as EVERY SINGLE catholic fraction (except for Scotland, HRE and Milan) has already done.

So now the "fun" begins: I wasn't the only allies of Egypt - they had another allied nation - The Papal States! Yes you read that right!

So what do you think happens when I join the crusade? I get my alliance broken with the Papal States, since I went to war with their ally. I got a reputation penalty for breaking the alliance (but it's still "reliable" though) and since I kinda pissed of the pope by answering his call for crusade, I lost HALF of my goddamn crosses!

Right before the cry for a crusade all fractions had at least 6-7 crosses, except for the excommunicated HRE and Milan, after everybody joined the crusade, there's no fraction with more than five crosses...

I mean seriously, what kind of dumbass pope call out a crusade on his ally, and then choose to stick with him!?

The pope is very schizophrenic (spel.?) or he has secretly converted to islam.