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The French government doesn't keep religious statistics on its citizens, but the US government puts the number of Catholics at over 80%, and a good third said when polled that "atheist" described them rather well. So there's a significant amount of overlap among those who identify with Catholic culture and traditions, but don't actually believe in the God.
People in Europe routinely overestimate how many Muslim immigrants are in their countries. That leads to nativism, which leads to fear, which leads to anger, which leads to hate, which leads to the Dark Side riots . . .
