Separation of morality and religion

Certainly one of the most dangerous errors of our age is the claim to separate morality from religion, thus removing all solid basis for any legislation. This intellectual error might perhaps have passed unnoticed and appeared less dangerous when it was confined to a few, and belief in God was still the common heritage of humanity, and was tacitly presumed even in the case of those who no longer professed it openly. But today, when atheism is spreading through the masses of the people, the practical consequences of such an error become dreadfully tangible, and realities of the saddest kind make their appearance in the world. In place of moral laws, which disappear together with the loss of faith in God, brute force is imposed, trampling on every right. Old time fidelity and honesty of conduct and mutual intercourse extolled so much even by the orators and poets of paganism, now give place to speculations in one's own affairs as in those of others without reference to conscience. In fact, how can any contract be maintained, and what value can any treaty have, in which every guarantee of conscience is lacking? And how can there be talk of guarantees of conscience, when all faith in God and all fear of God has vanished? Take away this basis, and with it all moral law falls, and there is no remedy left to stop the gradual but inevitable destruction of peoples, families, the state, civilization itself. (Papal Encyclical, Caritate Christi Compulsi, 3 May 1932).