Sola Scriptura is Untenable

First of all I suppose I should define the title of the blog.  "Sola" only "Scriptura" scripture is "untenable" unbelievable.  This is the foundational doctrine of Protestantism so I would expect that there is about a 50% chance that if anyone reads this they will disagree with my statement. 

First off the Catholic church permits the teaching that Scripture is "materially sufficient" but forbids the teaching that Scripture is "formally sufficient".  By permitting a teaching that does not mean that the Church actively teaches it.  Over the past few weeks I have come to believe that the Scripture is not even materially sufficient. 

The reason I believe this is that the New Testament Scriptures were not written on the direct command of Christ (with the exception of the Apocalypse) and instead were written through the derivative authority of the Church. 

And Jesus coming, spoke to them, saying: All power is given to me in heaven and in earth. Going therefore, teach ye all nations: baptizing them in the name of the Father and of the Son and of the Holy Ghost. Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.
(Mat 28:18-20 DRB)

And he said to them: Go ye into the whole world and preach the gospel to every creature. He that believeth and is baptized shall be saved: but he that believeth not shall he condemned.
(Mar 16:15-16 DRB)