I’m reproducing a several lines from Richard Niebuhr’s classic Christ and Culture. This excerpt does a fantastic job of explaining the constant complaint of the nation-state against the Christian faith:
The Christ who will not worship Satan to gain the world’s kingdoms is followed by Christians who will worship only Christ in unity with the Lord whom he serves. And this is intolerable to all defenders of society who are content that many gods should be worshipped if only Democracy or America or Germany or the Empire receives its due, religious homage. The antagonism of modern, tolerant culture to Christ is of course often disguised because it does not call its religious practices religious, reserving that term for certain specified rites connected with officially recognized sacred institutions; and also because it regards what it calls religion as one of many interests which can be placed alongside economics, art, science, politics, and techniques. Hence, the objection it voices to Christian monotheism appears in such injunctions only as that religion should be kept out of politics and business, or that Christian faith must learn to get along with other religions. What is often meant is that not only the claims of religious groups but all consideration of the claims of Christ and God should be banished from the spheres where other gods, called values, reign. The implied charge against Christian faith is like the ancient one: it imperils society by its attack on its religious life; it deprives social institutions of their cultic, sacred character; by its refusal to condone the pious superstitions of tolerant polytheism it threatens social unity. The charge lies not only against Christian organizations which use coercive means against what they define as false religions, but against the faith itself.