Well, they would disagree. And I think you'd include thousands of Orthodox Catholics in your false prophets.
So what now? If someone asks, "What is the Christian teaching?" What do you say?
It's "What I believe."
Why should they believe you?
All Scripture is given by inspiration of God and is profitable for doctrine for reproof for instruction in righteousness.
It matters not if I believe it as far as whether or not it is true.
It matters that God said it.
I do not say "What I believe." I say, "What Scripture says." The authority is higher than man that I point to. It is circular reasoning, I admit. I believe Scripture because Scripture says it is believable. But so is your reasoning "I believe that the Roman Catholic church is God's instrument of interpretation because that's what the Roman Catholic Church teaches."
Where church teaching seems to contradict Scripture, you go with church teaching on the subject as well as its interpretation of that Scripture.
I choose to believe Scripture over non-normative interpretations. My faith is in God, period. You have faith both in God, but specifically in the church for getting it right. Therein is the difference.