=chypmonk;7153553]Actually I just wanted to see if you really understand these above statements, and I see you do.The 2 statements above are both from Ecumenical Councils. There is no doubt they are infallible.
And often repeated
**INFALLIBLE TEACHINGS ( a.k.a. EX CATHEDRA) **
Pope Innocent III, Fourth Lateran Council, Constitution 1, 1215, ex cathedra:
“There is indeed one universal Church of the faithful, outside of which nobody at all is saved, in which Jesus Christ is both priest and sacrifice.”
Pope Boniface VIII, Unam Sanctam, Nov. 18, 1302, ex cathedra:
“With Faith urging us we are forced to believe and to hold the one, holy, Catholic Church and that, apostolic, and we firmly believe and simply confess this Church outside of which there is no salvation nor remission of sin… Furthermore, we declare, say, define, and proclaim to every human creature that they by necessity for salvation are entirely subject to the Roman Pontiff.”“Since however there is for both regulars and seculars, for superiors and subjects, for exempt and non-exempt, one universal Church, outside of which there is no salvation, for all of whom there is one Lord, one faith, and one baptism…”
Pope Leo X, Fifth Lateran Council, Session 11, Dec. 19, 1516, ex cathedra:
“For, regulars and seculars, prelates and subjects, exempt and non-exempt, belong to the one universal Church, outside of which no one at all is saved, and they all have one Lord and one faith.”
Pope Pius IV, Council of Trent, “Iniunctum nobis,” Nov. 13, 1565, ex cathedra Taken from PROFESSION OF FAITH:
“Also all other things taught, defined, and declared by the sacred canons and ecumenical Councils, and especially by the sacred and holy Synod of Trent, … I without hesitation accept and profess; and at the same time all things contrary thereto, and whatever heresies have been condemned, and rejected, and anathematized by the Church, I likewise condemn, reject, and anathematize. This true Catholic faith, outside of which no one can be saved… I now profess and truly hold…”
Pope Benedict XIV, Nuper ad nos, March 16, 1743, Profession of Faith:
“… And that this faith of the Catholic Church, without which no one can be saved. . . . “This true Catholic faith, outside of which none can be saved, which I now freely profess and truly hold…”
Dogmas don’t change their meaning thru time once pronounced infallible statements are…, well… dogma

:
Pope Pius IX, Vatican Council I, 1870, Session 4, Chap. 4:
“…the Roman Pontiff, when he speaks ex cathedra [from the Chair of Peter], that is, when carrying out the duty of the pastor and teacher of all Christians in accord with his supreme apostolic authority he explains a doctrine of faith or morals to be held by the universal Church… operates with that infallibility with which the divine Redeemer wished that His Church be instructed in defining doctrine on faith and morals; and so such definitions of the Roman Pontiff from himself, but not from the consensus of the Church, are unalterable.”[Denzinger 1839]
Pope Pius IX, First Vatican Council, Sess. 3, Chap. 2 on Revelation, 1870, ex cathedra:
“Hence, also, that understanding of its sacred dogmas must be perpetually retained, which Holy Mother Church has once declared; and there must never be a recession from that meaning under the specious name of a deeper understanding.” [Denzinger 1800]
While neier Dogma or Docrine can change a fuller understanding ADDING to thre maning, not changing it is feasible.
By virtue of a common Baptism, and belief in the Blessed Trinity ALL Christian salvation DOES flow through the CC. The Issue of forgiveness of sin requires perfect Contrition.
CC: 776 As sacrament, the Church is Christ’s instrument. “She is taken up by him also as the instrument for the salvation of all,” “the universal sacrament of salvation,” by which Christ is “at once manifesting and actualizing the mystery of God’s love for men.” The Church “is the visible plan of God’s love for humanity,” because God desires “that the whole human race may become one People of God, form one Body of Christ, and be built up into one temple of the Holy Spirit.”
**CC 819 **“Furthermore, many elements of sanctification and of truth” are found outside the visible confines of the Catholic Church: “the written Word of God; the life of grace; faith, hope, and charity, with the other interior gifts of the Holy Spirit, as well as visible elements.” Christ’s Spirit uses these Churches and ecclesial communities as means of salvation, whose power derives from the fullness of grace and truth that Christ has entrusted to the Catholic Church. All these blessings come from Christ and lead to him, and are in themselves calls to “Catholic unity.”