Thanks for your two posts: I learnt something.
This is a common misunderstanding. There are 23 churches that make up the Catholic Church and are in full communion with each other. The term "Roman Catholic" can cause confusion here, because it is sometimes used to refer to all the Churches in union with Rome, sometime it is used by people to mean the Latin Church, and sometime it's used pejoratively by protestants.
This is what I learnt so thanks. However, it leads to a problem. The ordinary word, catholic, means universal or all inclusive. So calling the set of 23 churches the Catholic Church amounts to a claim that there aren't any other (valid) churches. You never answered my question whether you believe that any Christians, outside the Catholic Church, will enter heaven. Given this I repeat the question.
"pejoratively by protestants" This betrays a certain degree of antagonism and unfriendly feeling against protestants i.e. people. There's a difference between saying "your doctrine is wrong" and "your behaviour is wrong". Your closing comment belongs to the latter.
which we call Tradition
The Catholic Catechism does not restrict "Tradition" to the Apostles of the New Testament.
Tradition transmits in its entirety the Word of God which has been entrusted to the apostles by Christ the Lord and the Holy Spirit. It transmits it to the successors of the apostles so that, enlightened by the Spirit of truth, they may faithfully preserve, expound and spread it abroad by their preaching
I assume this means Popes down the ages.
Through Tradition, "the Church, in her doctrine, life and worship, perpetuates and transmits to every generation all that she herself is, all that she believes." "The sayings of the holy Fathers are a witness to the life-giving presence of this Tradition, showing how its riches are poured out in the practice and life of the Church, in her belief and her prayer."
Again there is a claim of superiority and exclusiveness that has no basis in Scripture or God's nature.
"There is neither Jew nor Greek
" Gal 3:28 (many versions). Paul was trying to get across that labels such as this do not define who is a Christian, rather it is faith (i.e. trust) in Christ. Are you trusting Christ for your salvation or are you trusting your Church? I recommend the former.
Obviously, what that act of building is meant to be a temporary project with the result being permanent.
There's a building phase and an occupation phase in any building project. You're right that Jesus
built His Church on the rock that was Peter. This is recorded in the early chapters of Acts. To say that the Popes are also being built on goes against the meaning of the word build and the fact that Jesus was talking to Peter with no indication of any succession.
I'm glad you quoted your Protestant Bible commentator
This comes across as adversarial. Apparently he's not as biased as the typical "protestant" commentator would be according to your way of thinking. If you were to quote a catholic commentator I would evaluate what (s)he said, not label her/him up front as biased.
I could say that, given what happened to Shebna, this might not be a model to pursue too far. Benedict might not have been able to enjoy such a quiet departure depending on God's judgment of him. Shebna was violently rejected by God for trying to obtain a grave among the kings of Israel, so this was not a normal succession as per Popes in the Catholic Church. The only other use of the Hebrew for "steward" in Is 22:15 is of the Shunammite girl who kept the aged David warm at night (1 Ki 1:2-4). I don't see any idea of natural succession there either.