Wait a minute. I think you're getting too big for your britches.
The word of God is the word of God. The Catholic Church did not determine the word of God. The main claim the Catholic Church can make is that they were the willing vessels through which God did his work.
And about Luther's commentary on St. John "they possess the Word of God which we received from them, otherwise we should have known nothing at all about it"
Here Luther is in error. This is like saying Jesus would not have been born if it had not been for Mary. God will have his way, for he is God.
There is only one being without error and without flaw. That is God. To venerate the Catholic Church or Luther or Mary as flawless and without error is just plain wrong.
Think whatever you want but the fact is that Pope St. Innocent I (401-417) in 405 A.D. approved the 73 book canon and closed the canon of the Bible. This after the following occured:
Pope Damasus in 382 A.D., prompted by the Council of Rome, wrote a decree listing the present Old Testament and New Testament canon of 73 books.
The Council of Hippo in 393 A.D. approved the present Old Testament and New Testament canon of 73 books.
The Council of Carthage in 397 A.D. approved the same Old Testament and New Testament canon of 73 books.
Prior to the actions of Pope St. Innocent I there were some of the opinion that Hebrews, Jude, Revelation, 2 Peter were not inspired while others believed that certain noncanonical books were inspired, Shepherd of Hermas, Gospels of Peter and Thomas, the letters of Barnabas and Clement were inspired. The Catholic Church used her authority under the guidance of the Holy Spirit, as Christ promised and did indeed determine what was and what was not canon. Catholic authors wrote the inspired text of the New Testament. Rejecting any of this shows you are ignorant of history.
Here Luther is in error.
Luther was wrong about a lot of things but this wasn't one of them. It's a common crutch for Protestants to rely on when they disagree with him to say he was wrong but when they agree with him he was right. Thus by their own admissions he isn't a good foundation to base a "Reformation" upon.
To venerate the Catholic Church or Luther or Mary as flawless and without error is just plain wrong.
Christ assured us in Scripture that the gates of hell would not prevail against His Church. Christ assured us that the Holy Spirit would guide His Church in His absence. Christ left a Church to teach, govern and sanctify in His name until the end of time. Are you implying that Christ lied?