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ManusJustus said:
Religion makes it easier for wars to occur, but in most cases religion isn't the cause for war. For instance, the Crusades were caused by European desire to conquer new lands and acquire wealth (just as the Muslims did in the Balkans and Iberia), but it was easier to recruit soldiers, raise money, and keep morale high by using religion as the reason.

This ^

And because the crusades failed we started looking for new trade routs as the east was blocked by more powerful empires(Islam, China). And that's how colonization of the world began and how Christianity spread like a .......

But religion had massive influence on the European powers during the middle ages. A German emperor of the first reich even had to kiss the feet of a pope and beg for forgiveness. They could convince the European powers to take up their arms and fight a "Holy War" against the Muslims.