But we all disagree with each other as to the meaning of Scripture, the Old and New Testament. Whose interpretation of Scripture is authoritative?
That is a debate that has been going on for two thousand years.
The letters of the apostles contain doctrine and correction for existing churches. And for very good reason. People see things differently to each other. That is why politics contains so many politicians, with varying opinions on every single policy.
Different churches down through church history have released their doctrine, in order, to stamp out heresy.
There is often debate within each church organizations over their doctrinal platform.
Schisms occur in every church movement, always have and always will.
A perfect example of a schism in church history. Would be the departure of both the Eastern Orthodox and the Greek Orthodox Church. From the Roman Catholic Church.
Nearly every church movement in the world was an earlier departure from pre-existing mainline church.
I could not count the number of individual church organizations that flowed from the original, Protestant churches.
Inquisitions existed to combat heresy, to eradicate different interpretations of the scripture.
Conflict between interpretations is ultimately a work of the flesh.