As an atheist, I have no skin in the game of Christian vs Moslem. But if we are discussing history, it is worthwhile to remember that the early Moslems of various nations attacked the Christians first. Beginning with the conversion-by-sword across Christian North Africa, continuing into Christian Spain and Christian Southeast Europe, the Moslems began a fight that continues to this day.
Europe at the time was fighting off Vikings from the North, Huns from the Eastern steppes, and Moslems from the Southwest and southeast. To survive, it is little surprise that Christian Europe became an alliance of various thugs and butchers (politely called "knights").
When those thugs organized sufficient armies to push the war to the Moslem home territory, the Moslems cried "foul"! And that continues to this day.
I'm not on either side, but I know hypocrisy when I see it.