I just found an insane amount of quotes about “Outside the Church there is no salvation” from Early Church Fathers, Councils, etc. here:
romancatholicism.org/jansenism/tradition-eens.htm
Here are the ones that stick out the most clearly:
Saint Augustine, Doctor, (died A.D. 430): “No man can find salvation except in the Catholic Church. Outside the Catholic Church one can have everything except salvation. One can have honour, one can have the sacraments, one can sing alleluia, one can answer amen, one can have faith in the name of the Father and of the Son and of the Holy Ghost, and preach it too, but never can one find salvation except in the Catholic Church.” (Sermon to the People of Caesaria)
Pope Pius XI, A.D. 1922-1939: “Furthermore, in this one Church of Christ no man can be or remain who does not accept, recognize and obey the authority and supremacy of Peter and his legitimate successors. Did not the ancestors of those who are now entangled in the errors of Photius [the eastern “Orthodox” schismatics] and the reformers [the Protestants], obey the Bishop of Rome, the chief shepherd of souls? Alas their children left the home of their fathers, but it did not fall to the ground and perish for ever, for it was supported by God. Let them therefore return to their common Father, who, forgetting the insults previously heaped on the Apostolic See, will receive them in the most loving fashion. For if, as they continually state, they long to be united with Us and ours, why do they not hasten to enter the Church, “the Mother and mistress of all Christ’s faithful?” Let them hear Lactantius crying out: “The Catholic Church is alone in keeping the true worship. This is the fount of truth, this is the house of Faith, this is the temple of God: if any man enter not here, or if any man go forth from it, he is a stranger to the hope of life and salvation. Let none delude himself with obstinate wrangling. For life and salvation are here concerned, which will be lost and entirely destroyed, unless their interests are carefully and assiduously kept in mind.”” (Mortalium Animos. The Papal Encyclicals, Claudia Carlen, I.H.M., McGrath Publishing Co., 1981)
*** INFALLIBLE ***: Ex cathedra: “We declare, we say, we define, and we pronounce that it is wholly necessary for the salvation of every human creature to be subject to the Roman Pontiff. The Lateran, November 14th, in our eighth year. As a perpetual memorial of this matter.” (Unam Sanctam, A.D. 1302)
Pope Gregory XVI, A.D. 1831-1846 (D.1613): “Now we examine another prolific cause of evils by which, we lament, the Church is at present afflicted, namely indifferentism, or that base opinion which has become prevalent everywhere through the deceit of wicked men, that eternal salvation of the soul can be acquired by any profession of faith whatsoever, if morals are conformed to the standard of the just and the honest. Surely, in so clear a matter, you will drive this deadly error far from the people committed to your care. With the admonition of the apostle that “there is one God, one faith, one baptism” may those fear who contrive the notion that the safe harbour of salvation is open to persons of any religion whatever. They should consider the testimony of Christ Himself that those who are not with Christ are against Him, and that they disperse unhappily who do not gather with Him. Therefore “without a doubt, they will perish forever, unless they hold the Catholic faith whole and inviolate.” Let them hear Jerome who, while the Church was torn into three parts by schism, tells us that whenever someone tried to persuade him to join his group he always exclaimed: “He who is for the See of Peter is for me.” A schismatic flatters himself falsely if he asserts that he, too, has been washed in the waters of regeneration. Indeed Augustine would reply to such a man: “The branch has the same form when it has been cut off from the vine; but of what profit for it is the form, if it does not live from the root?”” (Mirari Vos Arbitramur)
This could not more clearly state that if you are NOT a member of the Catholic Church you WILL NOT BE SAVED. If the Church today does not profess this (To me it does not seem like it does), then the Church of today is in error. I hope somebody can correct me, for the sake of Catholics everywhere.