Hi Steve, thanks for making me feel welcome!
I’ll need to take you points one at a time.
Why just the written word? The Church existed and flourished for nearly 400 years before the books you currently find in your Bible were proclaimed and canonized as the word of God.
I think the flaw in your reasoning is this: Just because the Cannon of Scripture had not been established and proclaimed by a council, that does not prove that Scripture did not exist. It clearly did. The Church Fathers quoted from it (as soon as the 2nd Century), we have copies of the New Testament from the 200s and it was even translated into other languages.
The Christians who were alive at the time the books and letters were written knew which book were authentic and this was passed down to later generations. Pastors need to know what books were authoritative. People died protecting copies of the New Testament - they wanted to know what books were worth dying for.
Why was the Cannon established at all? It was established because false books had begun to circulate and were being used to promote false doctrine. The Church as a whole was not surprised when the Canon was proclaimed because it contained the books already widely held to be authoritative,
The New Testament is only that part of Sacred Tradition that was committed to writing.
Exactly. We agree that Christ promised to guide the Apostles into all truth. The question is why did the Apostles, under the inspiration of the Holy Spirit, choose to commit this information to writing? The obvious answer is that this information needed to be accurately preserved for future generations. This means that there was other information that they chose not to record in this way. Why? The most obvious answer is that it was not as important.
There is nothing in the Bible that supports the claim that the ultimate authority is the written word. It certainly wasn’t at the time the books were written.
Well, actually I believe it was.
First, we have to remember that in the Jewish tradition, Scripture was the ultimate authority. Jesus modeled this by constantly quoting them. The Apostles quoted the Old Testament in their writings. None of the Apostles need to be taught anything about the role of Scripture. They already regarded Scripture as the ultimate authority. Jesus has not taught them differently.
With that in mind, consider this verse:
(2 Pet 3:16 NIV) He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.
Here the Apostle Peter calls the letters of the Apostle Paul “Scripture”, placing them in the same category as the 39 Books of the Old Testament. Significantly, he mentions it in passing, as if it were something his readers already knew full well.
Clearly, the early Church considered the
writings of the Apostles to be authoritative Scripture.
The ultimate authority was the Tradition of the Apostles.
Yes, and I believe they were faithful to commit it to the Scriptures.