45 The culture and praxis of totalitarianism also involve a rejection of the Church. The State or the party which claims to be able to lead history towards perfect goodness, and which sets itself above all values, cannot tolerate the affirmation of an objective criterion of good and evil beyond the will of those in power, since such a criterion, in given circumstances, could be used to judge their actions. This explains why totalitarianism attempts to destroy the Church, or at least to reduce her to submission, making her an instrument of its own ideological apparatus. Furthermore, the totalitarian State tends to absorb within itself the nation, society, the family, religious groups and individuals themselves. In defending her own freedom, the Church is also defending the human person, who must obey God rather than men (cf. Acts 5:29), as well as defending the family, the various social organizations and nations — all of which enjoy their own spheres of autonomy and sovereignty.
Source: Centesimus Annus (Vatican.va)