Emeraldisle, let me pose another question.
Let’s say I’m living around 275 AD, somewhere in the Roman empire. By what method am I going to learn about Christianity? My congregation, like others in the region, has access to the four gospels, although many in my area are familiar with Gnostic texts, even reading them at their services. I am highly familiar with the Didache, which amounts to an early form of Catechism, written around 80 AD, while some of the Apostles were still alive. I hold in reverence the letters of Clement and Ignatius of Antioch, and their stories of the Church are read alongside some of the Letters of Paul at services (not all of his letters have made it to my area). Revelation is rejected by my congregation, as is the Epistle of James.
Let’s say later on I move to a different part of the empire. In my new congregation, the Gospel of Thomas stands alongside the other gospels, as well as the Gospel of Philip. The Didache and Letters of Ignatius are not used, but Revelation is held in high regard. Most of Paul’s writings are completely absent. I’m confused about the message I’m receiving about the absence of a “Trinity”. In this congregation, Jesus is the adopted Son of God. There is no Holy Spirit at all. Fortunately, a local bishop has traveled to the region to preach about the errors taking place in this congregation. He informs the locals of the traditions that have been passed down to him from the apostles. He shows how other congregations have not followed them in their error, and urges them to change.
Now, since the Holy Scriptures are all I need, am I receiving sufficient instruction from them in Christianity, or do also need to learn directly from the traditions of my congregation and priests and bishops who are only a couple of generations removed from the Apostles?