The reason for the Church's vilification at various points is precisely this immutable nature.
So are you saying that Simony is still freely practiced and encouraged within Rome? Or are you completely ignoring the 800# gorilla of Luther's Ninety-Five Theses?
The immutable nature is visible in the way we don't put things up to vote as the PCUSA did for example.
The PCUSA is Apostate and its clergy is Reprobate, everyone knows that.
Sure, there are bad eggs, even evil ones, but the family that is The Church is bigger than that precisely because we have as our Head Priest Jesus Christ who protects it through the ages.
Funny, since Protestants say the exact thing, but I would bet that we mean different things. For example, when you say "The Church" you are referring to that man-made government centered in Rome whereas when the Bible speaks of "The Church" the idea is all the Saints who make up the Corpus Christi, regardless of Rome's demand that their petty religious architecture is properly venerated and given credit.
Which shows the superiority of the Original system where there were loose Congregations spread around the world united in their Faith rather than united in fear of a religious government wielding the torch and iron maiden to "enforce" properly fealty to Rome. So when Reprobates and Perverts take over the man-made system known as PC-USA, the true church made up of the Elect will be moved by the Spirit to leave that house of Ichabod and find a new pastor. When your pedophiles and perverts do what Reprobates do, Rome circles the wagons and fights off the civil lawsuits - typical of what human government would and should do.
Neither of those are doctrines....
Oh, and when we talk of the Church we talk of the community of believers that is orthodoxy with our traditional Anglican and Lutheran friends. However, the calvingod is not the Christian God.
I agree that it was a mistake to put those criminals in the 70s - 80s in “correctional psychological retreats” instead of chucking them out, yet there has been a learning from this and they are being thrown out — the Church remains pure as its High Priest is pure, irrespective of the corruption of ministerial priesthood or lay priesthood.
The original Apostolic Church was with 5 sees: Alexandria, Jerusalem, Antioch, Rome and Constantinople with each of these holding succession from an Apostle giving them the authority to correct those straying. The first among equals in respect was Rome. The error was in translating this to political power which occured in the 12th century after the Avignon exile and intermittently in teh 8th-9th. In either cases it was to provide a form of stability in a vacuum when either central authority had collapsed or was in civil war.
The Early Christians viewed the spiritual / teaching authority of the Pentarchy as a way to eliminate anarchy -- which was pretty much needed with the rise of Manichaenism,Gnosticism, Mazdaism, etc. etc.
There was no "system" like in the various congregational types today where people vote on dogma.
The Bishops/Elders of the various places taught by the Apostles had their duty to ensure the faith as handed down from Jesus Christ through the Apostles was correctly handed down to later generations. Just as the various disciples (such as Thaddeus of Edessa) were in obedience to the Apostles (such as St. Peter) and the Apostles to Christ, so too were the descendent bishops in obedience on dogma to the bishops of the pentarchy and in obedience to Christ
Christ did not establish multiple brides but one Bride.