Note: This response assumes the crusades to mean the free trips to Jerusalem, mostly. I didn't know that some consider the inquisition a crusade also.
I'm not an expert but I don't think there was anything of any size besides catholics until that snippety Martin Luther came along. So yea, it was the catholics.
Not that the fundy's wouldn't have joined up had they been there. They just didn't exist yet. Sometimes it takes a couple of millennia to find ways to mess up holy texts even more.
By the way, small historical footnote that I remember reading somewhere (and I hope that someone in the know can confirm or deny), to practice killing people by the thousands, one of the crusades started out by killing lots of jewish farmers in Europe, driving the survivors from the land and in to the cities, where they diligently learned to survive in business and the arts instead of plowing. Which is one of the reasons we have ended up with lots of jewish merchants and such.