@Vanderhoven7
Your concern is rooted in a perfectly Catholic instinct: we may never relativize the deity of Christ or the dogma extra Ecclesiam nulla salus. If Vatican II had done so, it would indeed have ruptured the deposit of faith. The Council, read in the only manner a Catholic may read any council—within the living continuity of previous definitions—did no such thing.
When Lumen gentium 16 and Nostra aetate 3 say that Muslims “together with us adore the one, merciful God,” the Council is describing the objective reference of Islamic prayer, not canonising its subjective adequacy. The phrase echoes Pius XI’s Mit Brennender Sorge (1937), which praised the “one, true, living God” acknowledged by “adorers of Allah,” and it rests on a distinction found already in the Fathers and in Aquinas: a person can intend to worship the Creator while remaining gravely in error about His inner life. For that reason the Council immediately adds that Muslims “do not acknowledge Jesus as God.” To recognise a fragment of truth is not to canonise the whole; it merely states the obvious philosophical fact that “God” in Arabic, Greek or Latin denotes the same uncreated First Cause, however distorted the adorers’ concept may be.
The citation of the Council’s words regarding Muslims—“together with us adore the one, merciful God”—does not, and never did, mean that Islam or any non-Christian religion is salvific in itself, nor that such worship is acceptable to God in the sense that it possesses the fullness of truth or is salvific apart from Christ and His Church. The Council’s expression is a limited, philosophical acknowledgment of the intention behind Islamic worship—not an approbation of Islam as a religion or a negation of dogma.
The Council nowhere denies that obstinate rejection of the Trinity destroys the virtue of faith. On the contrary, it repeats Trent’s teaching that faith is supernatural assent to all that God reveals (DV 5, LG 14). It repeats Pius XII’s doctrine that those who know the Church to be necessary and refuse to enter it cannot be saved (LG 14; cf. Mystici Corporis 30). It re-affirms that “all salvation comes from Christ the Head through the Church which is His Body” (LG 14, AG 7). What it adds is a restatement, in the language of the twentieth century, of Pius IX’s and Pius XII’s insistence that inculpable ignorance does not bind a man to an impossible duty (DH 14; GS 22; Suprema haec sacra). If a Muslim dies rejecting the Trinity with full light and full consent, he is lost; if he has never grasped the Gospel through no fault of his own, the Holy Spirit can impart the grace of Christ in a hidden way and lead him to a salvific act of faith before death. That possibility is not a “loophole” invented in 1965; it is the ordinary magisterium from St Thomas (ST II-II 2, a.7) to the Holy Office letter of 1949.
Thus Vatican II does teach that outside the Church “there is no salvation”—understanding the axiom exactly as the 1949 Holy Office explained: membership can be in re (actual) or in voto (by an implicit or explicit desire animated by charity). What it refuses to do is to catalogue which individuals are damned; such judgments belong to God alone. But it leaves no doubt that the ordinary means of salvation is baptismal incorporation into the visible Catholic communion, nourished by the sacraments and the profession of the Catholic faith, and that every human being must ultimately be gathered into that communion or perish.
The root of your anxiety seems to be the worry that Vatican II and subsequent Catholic teaching have somehow nullified the axiom extra Ecclesiam nulla salus—outside the Church there is no salvation. This is a false dichotomy. The Church, faithful to Christ’s mandate, has always maintained that all salvation comes through Christ the Lord and is applied through His Mystical Body, the Church. This doctrine is not up for revision; it is de fide and was reaffirmed at Vatican II and after, including in the Catechism and magisterial documents such as Dominus Iesus.
The Council does not, as you imply, announce to Muslims or to anyone else that their religion is salvific or pleasing to God in itself. Nor does it make ambiguous the fate of those who knowingly reject the central mysteries of the faith. Rather, it follows the classic distinction articulated by St. Thomas Aquinas and reiterated by Popes and Councils throughout history: God’s grace is not limited by visible boundaries, but His ordinary means of salvation is the Church and her sacraments. All who are saved are saved only by the merits of Christ and through incorporation—whether explicit or implicit—into His Body, the Church. Vatican II explicitly reaffirms this: “Basing itself upon Sacred Scripture and Tradition, [the Council] teaches that the Church, now sojourning on earth as an exile, is necessary for salvation. Christ present to us in His Body, which is the Church, is the one Mediator and the unique way of salvation” (Lumen Gentium 14).
Far from encouraging Muslims to rest content, the Council explicitly mandates the Church to preach Christ to them “openly and unambiguously” (AG 7, 11). Its recognition of a fragmentary truth in Islam is the very premise of evangelisation: missionaries can build on what nature and prevenient grace have preserved, so as to bring the nations to “the obedience of faith” (Rom 1:5). Any reading of Vatican II that dilutes that missionary imperative is a hermeneutic of rupture, not of continuity, and must be rejected as contrary to both the letter and the spirit—indeed the mens—of the Council.
What then of the Council’s words on Muslims? The phrase “together with us they adore the one God” is not a statement about salvific sufficiency, but about the object—however imperfectly grasped—of their worship. The Church has always acknowledged, for instance, that the pagan philosophers could know something of the one Creator, yet this did not absolve them of the need for Christ and the Church. Vatican II does not teach, nor does any authoritative Catholic magisterial document, that Muslims or anyone else can be saved by remaining outside the Church with full knowledge and consent. In fact, the very same section of Lumen Gentium immediately reasserts: “Whosoever, therefore, knowing that the Catholic Church was made necessary by Christ, would refuse to enter or remain in it, could not be saved.” (LG 14, echoing Cantate Domino of Florence, and the 1949 Holy Office letter.)
It is essential here to read Lumen Gentium 16 and Nostra Aetate in continuity with this dogmatic tradition, as Pope Benedict XVI forcefully reminded the Church. The Council, pastoral in tone but dogmatic in foundation, does not teach that belief in the Trinity, the deity of Christ, or the sacramental economy are optional. The salvation of those “outside” is always by way of Christ and the Church—never by way of another religion as such. If a soul outside visible Catholic unity is saved, it is through an implicit desire for the truth and for God’s will (what St. Thomas calls the “baptism of desire”), never by stubborn adherence to error or formal rejection of Christ’s divinity or the Trinity.
Moreover, to accuse the Council or Catholics faithful to her of religious indifferentism is to misunderstand both the letter and the spirit of the Council. Vatican II does not say Muslims are saved by Islam, but rather that they acknowledge the one Creator and that this partial light, if followed sincerely, can dispose them—by God’s prevenient grace—to accept the fullness of revelation when offered. But as St. Thomas makes clear (Summa Theologiae II-II, q. 2, a. 7), those who remain in error out of invincible ignorance are not condemned for what they could not know, but those who “knowingly and obstinately” reject revealed truth are culpable. This is no modern innovation: Pius IX, Pius XII, and the Holy Office (1949) all affirm the same.
To summarize: Vatican II did not, and could not, abrogate the uniqueness of Christ or the necessity of the Catholic Church for salvation. Its statements about Muslims, Jews, or other non-Christians must be read as recognizing the elements of truth and goodness present wherever they are found—always for the sake of leading souls to Christ, never as an endorsement of error or a new soteriology. The fullness of salvation is found only in the Catholic Church, and anyone saved is saved by the merits of Christ, through His Body, whether they know it or not. Once the truth is known, it must be embraced or salvation is imperiled.
So, to your direct question: yes, the Catholic Church still teaches that there is no salvation outside her; yes, rejection of the Trinity with sufficient knowledge is mortally sinful and, if unrepented, damns the soul; and no, Vatican II did not compromise those truths. It merely restated the perennial principle that God’s grace can reach a man before the sacrament does, while insisting more urgently than ever that the sacrament, the Creed and the visible communion of Peter remain the divinely willed, ordinarily necessary path to eternal life.
The Church warns that deliberate rejection of revealed truth excludes from salvation, but she also professes that God’s mercy can reach souls in ways known only to Him—never bypassing Christ or the Church, but sometimes applying their saving power outside visible bounds. This is not modernist compromise, but the perennial doctrine of the Fathers and Doctors, confirmed by the magisterium in every age. To claim otherwise is to misread the Council and to sever it from the continuous witness of the Catholic faith.