That's the point, it's not up to humans but, up to God
How the hell do you explain things like Vatican 2, then?
The Orthodx Church is THE church because it has barely changed, whereas the Catholics are only a few steps behind their Protestant colleagues in rewriting the book. One of the reasons the Orthodox Church is unchanging is because of its conciliar form of government. Everybody has to agree for a change to be made, and that never happens.
The next reason is because of all the churches listed in the Bible, only one remains in the West and all the others are still Eastern. So if 80% of the churches still follow something, then it must be the other one which is too smart for its own good.
In addition to the above, Tradition anchors the Orthodox faith, passed down by the Fathers, not some Pope.