36 This, then, is the teaching of the Catholic Church concerning the constitution and government of the State. By the words and decrees just cited, if judged dispassionately, no one of the several forms of government is in itself condemned, inasmuch as none of them contains anything contrary to Catholic doctrine, and all of them are capable, if wisely and justly managed, to insure the welfare of the State. Neither is it blameworthy in itself, in any manner, for the people to have a share greater or less, in the government: for at certain times, and under certain laws, such participation may not only be of benefit to the citizens, but may even be of obligation. Nor is there any reason why any one should accuse the Church of being wanting in gentleness of action or largeness of view, or of being opposed to real and lawful liberty. The Church, indeed, deems it unlawful to place the various forms of divine worship on the same footing as the true religion, but does not, on that account, condemn those rulers who, for the sake of securing some great good or of hindering some great evil, allow patiently custom or usage to be a kind of sanction for each kind of religion having its place in the State. And, in fact, the Church is wont to take earnest heed that no one shall be forced to embrace the Catholic faith against his will, for, as St. Augustine wisely reminds us, "Man cannot believe otherwise than of his own will."
Source: Immortale Dei (Vatican.va)