"All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be PERFECT, THROUGHLY FURNISHED unto ALL good works" (2 Tim. 3:16-17).
"Profitable" means that the Holy Scripture adds to something and increases it. What is that something we know from Paul also: it is the Holy Tradition (2 Thess. 2:14). "Perfect, throughly furnished" means that the Holy Scripture completes the formation; but the passage does not say that the scripture is sufficient for the said formation. It certainly does not say anything about faith formation of the laity.
Since you guys removed seven books from the Holy Scripture, it is silly for the Protestants of all people to claim any kind of reliance on it.
To learn more, read On Holy Scripture and Holy Tradition.
No, since you added books to the Bible, you are the ones that show contempt for it.
Even many of your own theologians, before Trent, did not regard those books as Canonical.
As for 'tradition' the tradition that Paul is speaking of is the tradition he gave to the church, that is the example that he showed.
Christ condemned tradition when it is used to supplant or undermine scripture (Mk.7:7-3)