2/3 of the Holy Scriptures were already written - the very same that Christ fulfilled. The Church was born into a world God had already prepared.
“I think you overestimate how much Scriptural Truth the flock retained.”
This is your opinion-you are entitled to hold it. It could be equally argued that aural tradition/teaching societies retain more. I have see this reported on before we had the Internet.
God set Teachers in His Church as a gift of the Spirit. They have always been there and are today. They don’t, however teach what they invent. They teach the Scriptures.
“2/3 of the Holy Scriptures were already written”
Exactly. The Bible wasn’t complete. And so they looked to the Church for guidance.
“They teach the Scriptures.”
They, and many if not most of the priests in the Catholic Church, usually don’t teach that birth control is wrong. But it is condemned as the sin of Onan in the Old Testament, and it is the “magic potions” referred to in Revelation 9:21.
“They don’t, however teach what they invent.”
They do in my opinion. They have pulled out the scandal of widespread divorce among Christians as scriptural, when it isn’t there. They say Jesus permitted divorce in cases of “adultery”. This is incorrect. Jesus was talking about marriages which were not valid in the first place because they were taking place among close blood relatives and therefore weren’t permissible. Jesus was using a very narrow term which has been blown up into divorce for almost any reason. And what about the Christians who say divorce is permissible when there has been no adultery? Isn’t this what basically happened with Amy Grant? Many walked away from Jesus because they clearly understood that he wasn’t talking spiritually when He gave the teaching on the Holy Eucharist, but was talking literally. Why do so many fundamentalists suddenly say Jesus was only talking spiritually when that doesn’t make common sense? Why would so many disciples walk away if he were only talking spiritually? The only 6:66 in the New Testament is John 6:66 where many of the disciples walked away because of the teaching of Jesus on the Holy Eucharist. Will many Christians walk away from Jesus during the time of 666, the time of Anti-Christ, because they don’t find the strength to persevere without the Holy Eucharist? This teaching was assented to by virtually all Christians until after Martin Luther. Martin Luther himself accepted it. The Holy Eucharist as only symbolic is a very recent invention within Christendom. The Rapture was largely unheard of among Christians until a Scottish minister made it popular a couple of centuries ago. I admit some of the Church fathers disagreed on this teaching, but their influence on the teaching wasn’t widespread. Rome has always taught against it.