I know what you claim.
However, when I evaluate the evidence and the counter evidence, I find I must make certain leaps and assumptions to arrive at the same conclusions that you do.
I think that in ANY such endeavor one must make leaps and assumptions. These are called “Faith”.
One of the Greatest assumptions in the Protestant world relates to the Bible and Sola Scriptura.
This is not the fault of most protestants today, since they were raise and taught this from day one, but many seem to think that The Holy Bible sort of “fell from the sky”. I say this somewhat, “tongue in cheek”, only to say that many protestants are ignorant of how the Bible got into their hands. They might hear about how the catholics, “made it illegal to read the bible” and “kept it in latin” and other outright falshoods, but they never here about the councils of Hippo and Carthage where the Bible canon was set by the Bishops of the Catholic Church at 72 books. They never hear about how the Catholic Church translated, copied, promulgated, Protected and defended The Holy bible for 1000 years before Luther. They never here about the 7 additional Church councils that reaffirmed the canon of the Bible, all before the Protestant Reformation. They never hear about how the first thing that the Sola Scripturists did was to change the Bible from 72 to 66 books.
Finally - I would like to point out that, while protestants will go to great lengths in time and argument to try and disprove the “Authority” aspect of Christ’s Church, most seem oblivious to the HUGE elephant sitting in the middle of their own core doctrine of "Sola or Prima or Solo Scriptura and personal interpretation.
That elephant is the simple fact of confusion within protestantism. If the Holy Spirit is truly Guiding and All one needs is this and the Bible, then there should be great unity in Doctrine and Practice among the “Reformed Churches”. In fact, there should be but one “Reformed” Church clearly dating from the mid-late 1500’s and teaching consistant doctrines since that time.
Such a Church could certainly claim a victory for SS and “Spirit Guided interpretation”. Alas such a Church does not exist. It died an early death when Luther, Calvin, Zwingli and others could not agree with each other in Christian Love and work together to reform “The Church”. Instead they parted ways. Each founding their own brand of protestantism and the prideful splitting apart continues to this day.
This then brings us back to the subject of the O.P. which is, “How can this be possible” that there are so many conflicting and competing “Christian Churches” when Christ Prayed they be one; When St Paul exhorted they be “Of One Mind”; when Christ told us to “Tell it To The Church”.
What I say here is not a reflection on the sincereity of my NCC brothers, but rather a true reflection of why I came Home to the Catholic Church rather than join a NCC denomination.
Peace
James