The middle east is chaotic and very feudal in places; power and corruption are rife. You can't pin the situation on "religion". Where did the jews come into WWI ? and in WWII the Nazis persecuted non-Christian non-white non-heterosexuals - there was not much of a specific anti-religious message there, more of an anti-non-aryan message. The Jews were targeted for more economic reasons then due to religion.
Even the crusades is an iffy one as it was as much to do with the Catholic church showing its power and claiming a territory as it was "islam vs christianity".
Course, thats just my take. Not researched this recently
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