Anyone opening the New Testament for the first time will find a book that does not attempt a systematic explication of the Gospel, but is a collections of writings loosely related. It alluded to people and events unknown to us. We do not find the names of the authors of of many of these texts in the writings themselves. It cries out for an authoritative interpreter, so that we must say with the Ethyiopian encountered by the deacon Phillip. “How shall I know what this means unless someone interpret it.” We do know by reading it that there is something called the Church. We do know from history that the Catholic Church has existed since that time, has a history that you deride. We do know that Protestant bodies have existed for less than 500 of those years and have a history of their own, with what Catholics can claim, inventions of their own,” in addition to the ones that stand in direct opposition to papal authority, and which cannot be traced back to the time of Christ.
From your post I can immediately assume you are catholic...the reasons are your writing fits the general mode in use of words and form of writing, which I addressed in a previous post. Taking the long way around to make a point until the point is often lost along the way.
However to respond to the verse mentioned...”How shall I know what this means unless someone interpret it.”
The Spirit of God who inspired and moved those to write can certainly interpret His own work.... and as Jesus said will teach and guide us into His truths. Since He is the “author” and finisher of our faith He can certainly be trusted to reveal what we should know. It is this Christ as our “authority” we should look to and for interpretation...and as much the wisdom of how we apply what He has revealed.
Books can be and are helpful...but if there is any authority to trust it is in Him and the written word He gave us.