Have there been religious wars in the last two thousand years? Yes. Have there also been wars over money, land, ego, women, slavery, democracy, freedom, communism, fascism, Nazism, terrorism and just about everything else you can imagine? Yes.
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More to the point, Christians need to stop perpetuating the myth that we’ve basically been huge failures in the world. That may win us an audience with non-Christians, but it’s not true. We are sinners like everyone else, so our record is mixed. We’ve been stupid and selfish over the years. But we’ve also been the salt of the earth.