Surely you jest. Montanism to the core. Roman Catholicism does not preach just as the Church had from the beginning; it developed doctrine, new revelation, versus faith once delivered. C'mon let's be realistic here. You say it yourself, NT is just 'bits of communication' preserved.
You clearly don't know what Montanism is. But that isn't my issue here.
Catholicism does preach only what was taught from the apostles. The Church does not have any new revelation. Doctrine is based on what was already taught. Everything comes from apostolic tradition, that is, what the apostles taught. They Church cannot add anything to that.
The New Testament is mostly bits of communication that have been preserved. Are you saying that Luke was not a letter addressed to someone? That Paul's epistles were not addressed to certain people and communities? We preserve them because they are divine inspired, they speak from the apostolic deposit of faith.
What you are doing is making a baseless and scriptureless assumption that the New Testament was the only teaching God made known or wanted to be made known for all time.
The reason you believe that is because when protestants left the Church, they did not want to listen to the teaching authority of the Church. The only thing divinely inspired they had left was scripture. They decided to believe that the bible was the only thing God wanted them to know. They made a theological conclusion based on what they wanted.
If God wanted us only to have texts, then why did Jesus appoint twelve apostles and they appointed more apostles, more bishops, deacons, presbyters, etc? Why didn't Jesus just write a bunch of books and have missionaries to go out and preach from it? Instead, we have a collection of documents, most of which are assigned to people that weren't even part of the original twelve!
