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For many American Christians, the religious experience of modern Western Europe offers a dire warning. European church membership has been in free fall for a generation. Each new survey shows ever-growing numbers willing to proclaim themselves totally nonreligious. Meanwhile, burgeoning Muslim populations lead some observers to warn grimly of a coming Eurabia, a continent dominated by the most reactionary forms of Islamic fun damentalism. While native Christian populations have extraordinarily low fertility rates, immigrant Muslims continue to raise large families.