There have been some wars because of Religion, certainly. However, you have all your definitions mixed up. The Crusades were not wars, they were crusades, similar to a quest, they were a bunch of various people traveling down to the Holy Land with a goal. Each Crusade had different issues and different things going on. The Inquisitions were inquisitions. They were run by Monarchs, not the Church, and they inquired of persons whether they were witches, jews etc. They were horribly misguided. For the most part. The Holocaust was not a war, and not about Religion, since only one of the parties was religious, and the secular state of The Third Riech was Imprisoning and executing all who disagreed with them. There were as a matter of fact, 7 million Jews and 6 million Christians killed in the Holocaust. Also, Pope Pious is well know in Israel as a hero who helped get many Jews to safety, working behind the scenes in Europe at the time. This all happened DURING World War II which had absolutely nothing to do with religion.