3 At the outset, the absurd and monstrous character of the decree of which We speak is plain from the fact that it proclaims and enacts that the Republic shall have no religion, as if men individually and any association or nation did not depend upon Him who is the Maker and Preserver of all things; and then from the fact that it liberates Portugal from the observance of the Catholic religion, that religion, We say, which has ever been that nation's greatest safeguard and glory, and has been professed almost unanimously by its people. So let us take it that it has been their pleasure to sever that close alliance between Church and State, confirmed though it was by the solemn faith of treaties. Once this divorce was effected, it would at least have been logical to pay no further attention to the Church, and to leave her the enjoyment of the common liberty and rights which belong to every citizen and every respectable community of peoples. Quite otherwise, however, have things fallen out. This decree bears indeed the name of Separation, but it enacts in reality the reduction of the Church to utter want by the spoliation of her property, and to servitude to the State by oppression in all that touches her sacred power and spirit.
Source: Iamdudum (Vatican.va)