Hi, Thankful.
That the Catholic Church was the original Christian faith (with no “denominations” until the Orthodox Schism around 1066) is grounded not only Biblically (note Matthew 16:17-19 and, as the Apostles filled the empty office of Judas: Acts 1:16-26) but
in history. This is why we as Catholics are not worried about so-called contradictions in the Bible, for our founding members wrote what was to become the New Testament and were former members of the Old Testament.
The early writings of the Church Fathers (from St. Paul and beyond) confirm Catholic practices, which have changed very little since their inception.
Respectfully speaking, those who don’t believe that the Church isn’t the root of Christianity are ignorant of history, which is disappointing, for that is a denial of truth. The term “Protestant” means that someone was protesting against something. How could the Catholic Church protest against itself? It can do so only if a faction of it split off, which is what Martin Luther did, unwisely.
No Christian practice outside of the Catholic and Orthodox faiths are older than 600 years or so, starting at the Protestant Reformation. One man (and a Catholic priest at that), decided, on his own authority (and creating a
human tradition of faith) that 1500 years of Christian teaching should be revised. Again, this is human history, but that event redefined Christianity for many into thousands of groups today, with very few of them consistent in their teachings as the Catholic Church is today.
There *is *salvation outside of the Catholic Church. I’m sure of it. There are too many good people from all walks of life that do the Lord’s will and aren’t aware of it from a standpoint of faith. I, however, would not want to throw my bets in achieving salvation that way, now that I follow the central Way.