The operative word or phrase here is “I do not believe”. I would say “I do believe”.
Ok, I’ll bite, where can it be demonstrated that the Church has not always been infallible?
I won’t use examples that many Protestants here and elsewhere have, I am sure, referred to, such as Pope Liberius, Pope Zosimus, Pope Vigilius, and Pope Honorius.
However, I will mention Pope Boniface VIII, who stated the following in his Bull
Unam Sanctam: “Indeed we declare, say, pronounce, and define that it is altogether necessary to salvation for every human creature to be subject to the Roman Pontiff.”
Vatican II teaches the exact opposite of this declaration. According to the documents of Vatican II, Christians of other denominations may be saved. Non-Christians, specifically Jews and Muslims, may be saved. Pagans may be saved. Even those who do not explicitly know of the existence of God may be saved. It is logically possible that either Vatican II or *Unam Sanctam *are correct. It is also logically possible that neither Vatican II or *Unam Sanctam *are correct. It is not logically possible, however, that both Vatican II and *Unam Sanctam *are correct. According to Pope Boniface VIII “it is altogether
necessary to salvation for
every human creature to be subject to the Roman Pontiff.” But if non-Roman Catholics, non-Christians, pagans, and atheists may attain salvation, as Vatican II asserts, then it is
not altogether
necessary to salvation for
every human creature to be subject to the Roman Pontiff. According to Vatican II, some who are not subject to the Roman Pontiff may be saved.
In addition to Pope Boniface’s statements in his Bull, the Council of Florence (an ecumenical, hence, “infallible” council) also asserted much the same thing when it stated: “It firmly believes, professes, and proclaims that those not living within the Catholic Church, not only pagans, but also Jews and heretics and schismatics cannot become participants in eternal life, but will depart “into everlasting fire which was prepared for the devil and his angels” [Matt. 25:41], unless before the end of life the same have been added to the flock; and that the unity of the ecclesiastical body is so strong that only to those remaining in it are the sacraments of the Church of benefit for salvation, and do fastings, almsgiving, and other functions of piety and exercises of Christian service produce eternal reward, and that no one, whatever almsgiving he has practiced, even if he has shed blood for the name of Christ, can be saved, unless he has remained in the bosom and unity of the Catholic Church.”
Again, this would be a blatant contradiction of Vatican II documents such as Lumen Gentium.