31 The sovereignty of the people, however, and this without any reference to God, is held to reside in the multitude; which is doubtless a doctrine exceedingly well calculated to flatter and to inflame many passions, but which lacks all reasonable proof, and all power of insuring public safety and preserving order. Indeed, from the prevalence of this teaching, things have come to such a pass that may hold as an axiom of civil jurisprudence that seditions may be rightfully fostered. For the opinion prevails that princes are nothing more than delegates chosen to carry out the will of the people; whence it necessarily follows that all things are as changeable as the will of the people, so that risk of public disturbance is ever hanging over our heads. To hold, therefore, that there is no difference in matters of religion between forms that are unlike each other, and even contrary to each other, most clearly leads in the end to the rejection of all religion in both theory and practice. And this is the same thing as atheism, however it may differ from it in name. Men who really believe in the existence of God must, in order to be consistent with themselves and to avoid absurd conclusions, understand that differing modes of divine worship involving dissimilarity and conflict even on most important points cannot all be equally probable, equally good, and equally acceptable to God.
Source: Immortale Dei (Vatican.va)