there are bigger differences between the Roman rite and the Eastern Orthodox than many of the non-Catholic denominations.
There are major doctrinal differences that have existed for over 1,000 with both sides claiming to be the original form of Catholicism with the other being in schism.
They both can’t be right. So which one is?
So the variety in minor interpretations between Protestant churches isn’t as great as the Roman/Orthodox schism.
That invalidates your criticism of the weakness of, or rather inadequacy of, sola Scriptura.
The differences between Catholics and Orthodox are actually quite limited, although important. But I never claimed the individual could rely on Scripture alone. Both Catholics and Orthodox believe that we need the Church. We just have different definitions of that church.
As for Protestants, that are serious differences between Luther and Calvin. For one thing, is baptism a sacrament that is necessary for salvation? No small question. There is also the problem that the vast majority of Christians, including Catholics and Orthodox, read the Scriptures differently than the Protestants. The Bible alone is not a sure source of understanding.
It could be NEITHER.