He did not say that, not in 2 Timothy 3:14-17 or anywhere else. He said, "continue in what you have learned and have firmly believed, knowing from whom you learned it" -- that is, continue in the Tradition, -- and that the scripture (the Septuagint, to be precise) is "inspired" and "able to make you wise for salvation", and that the two together will make you "competent, equipped for every good work". The scripture says exactly what the Church teaches.
Well if you are saying the Catholic church than you are mistaken. The scriptures...from beginning to end are of Christ. The church has oftentimes failed as much as succeeded in equipping believers. The Church does not save us...Christ does...traditions do not save us...Scripture reveals Christ. To say the scriptures say what the church says is not always correct...history, time and tide evidences such.