They are doing it for their God, nonetheless. Ironic that liberals have only scorn for crusaders, who were in effect Christian Jihadists but are silent about the deeds of men who do much worse things.
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Islam is not a religion, and muslims do not worship God.
1 And the Lord spoke all these words: 2 I am the Lord thy God, who brought thee out of the land of Egypt, out of the house of bondage. 3 Thou shalt not have strange gods before me.