John 17:17 Sanctify them in the truth; your word is truth.
And again, differences in administration of local assemblies to not by default demand differences in doctrinal position.
There's no where in Scripture where submission to one central authority is required for the local churches, the local body of believers.
Also, that line of thinking completely ignores the work of the Holy Spirit in bringing about unity amongst believers through their faith in Christ and being born again believers.
I don't agree with every single thing that the other non-Catholics on this forum believer, but since there's room for dispute among non-essential doctrines, it's not an issue. Romans 14 addresses that.
Not to mention that the differences in interpretation of the magisterium, the CCC, the pope's latest gaffes, whatever, put any interdenominational differences between Evangelical groups to shame.
I see plenty of that here to the point where FRoman Catholics, in their arrogance, take a PRIEST to task about things he says and never admit they're wrong or apologize.
There's no where in Scripture where Scripture is stated to be the only source of teaching, for that matter. Oh well.........
Think about the early Church.....there was no New Testament. No book to turn to when disputes arose as they invariably did. It had yet to be written....and certainly not compiled or canonized. The Church did just fine because the Church gave us Scripture and not vice versa. Ergo the Church could grow and function without it.
Read Acts. What happened when Paul and Barnabas got into an argument in Antioch about circumcision?? They couldn't say....."well let's see what the Bible says about this!". They couldn't! No, Instead, Acts tells us that they returned to Jerusalem to consult with the "apostles and ancients" and it was in fact Peter who rose up to give the decisive oration.
That's the model! It was the "apostles and ancients" who resolved these issues, not Scripture.
It's the same today. There is nothing in Scripture about the morality of artificial contraception! There must be a living, breathing Magisterium, connected to the Apostles to decide on these matters.