In addition to this error, Rome claims its theology based on tradition was what the apostles were teaching. This is patently false as there was no immaculate conception taught. No purgatory taught. No reliance on Mary as mediatrix, advocatrix or any of the other non biblical claims by Rome.
So no, Roman Catholic tradition is discarded.
I didn’t say you’re following Roman Catholic teaching authority and Tradition. By my admittedly snarky comment about bing almost Catholic I meant that you acknowledge that as Christians we follow the authority and Tradition of men we believe have been given 1) a deposit of faith, 2) the right to define what constitutes Scripture, 3) the authority to interpret that Scripture, and 4) the right to pass it on in Christ’s name. You and I, for whatever reasons we believe to be convincing to each of us, simply rely on different men for that, and thus we believe many of the same things, but many different things.
In no way do I think these differences are unimportant. They are very important. Because if I’m wrong, for example, about the Eucharist being the body, blood, soul, and divinity of Jesus Christ, then I am an idolator. Certainly a sincere one, and perhaps that will serve me well at my final judgment, but an idolator nonetheless. And if you’re wrong, then you have no life within you.
So it is crucially important. But my point is simply that the Protestant claim to believe that the Bible is the only source of truth in Christianity is demonstrably false. There is no way to avoid relying on authority (what we Catholics call the magisterium) and Tradition, too.