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Before the United States entered World War I, forty-six million Protestants and sixty-two million Catholics were trying to kill forty-five million Protestants and sixty-three million Catholics on the other side. In that war, Christians succeeded in killing millions of other Christians. Reflecting back on the war in 1925, one Christian said, “Christian nations engaged in the most frightful carnage of history. No human device of cruelty and murder was too terrible to use. No human ingenuity was inappropriate for the purpose of destroying life. Nominal and real Christians fought other nominal and real Christians. Pulpits behind both trenches preached the crusade, held the cross before armed regiments and called down upon the carnage the blessing of God.
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Ronald J. Sider (If Jesus Is Lord: Loving Our Enemies in an Age of Violence)