You missed the point.
First, until the coming of the printing press most people did not read, everything was through oral communication. Since we obviously cannot have a record of oral communication, all we can rely upon is what was written at the time. If I am an archaeologist trying to piece together the world of the first century, I have to look at all the evidence, whether it is in the NT or not.
Second there was no “New Testament” in the first century, all we have are the writings listed above. The canon was not decided until centuries later. That is not what this thread is about.
This thread is about the first 100 years from the Resurrection of Christ to Justin Martyr, exactly 100 years. What did they believe? What kind of world did they walk in? How did they think? Why do the quotes I cited earlier in the thread point to Christianity that is very much in alignment with the Catholic Church?
Oh, I got your point. But the fact is that the job of the Church was to teach what Jesus & His disciples believed & taught. And what we know what they believed in taught is what is now known as the “New Testament” - most of which was recognized as Inspired Scripture by the mid-
first century, such as ALL of Paul’s epistles (2 Peter 3:15-16), as well as Luke’s (1 Timothy 5:18, cf. Luke 10:7). And had we lived in the first century, as did the first century Church, even if we couldn’t read Greek (which is what the NT was written in), we would be believing what the apostles, like Paul, Peter, James, & John said, because they backed up what they spoke & wrote by the miracles God worked through them. That’s why we can trust their writings as being Inspired, as well as the fact that none of them contradict themselves, nor contain any errors in them. The same can’t be said about Papias’ fragments, nor 1 Clement, etc, because they “do” contain errors in them, & it is questionable “who” even wrote the epistle to Barnabas (it’s not “universally” believed to be the “Barnabas” of Acts), let alone the Didache. That’s why God, through Jesus’ disciples, gave us the NT, so we could know what Jesus & His disciples believed & taught, and compare other people’s beliefs TO it, just as the Bereans did with the OT Scriptures, which is made them “more like-minded” than the Thessalonicans (Acts 17:10-11). And in order to for a piece of writing or belief to be “apostolically succeeded,” like a friend of mine said, "who is the “apostle” who said or believed it? And had we lived in the second century, when the NT
was completed, an “unofficial” NT canon, comprised of the same 27 books we had today, was in circulation in the Church, as was the term “New Testament” referring to those 27 books. However, as early as the early second century, although the writings - for the most part - were Scripturally sound, you “do” see discrepancies here & there, including second century ECF’s who disagreed with each other on things, including Papias. Plus, in terms of literacy, obviously there were churches who were literate, otherwise, there would be no point of Paul, & other NT writers, to write them letters, especially the churches in Rome & Corinth, which were his longest epistles, which Paul even states, “not to exceed what is written.” Obviously, they would have to have the ability to read, in order not to “exceed” what is “written.” So, although these non-inspired writings you listed there were written in the late-first, to early-second century are valuable because much of them agree with NT Scripture, because they aren’t Inspired Scripture, & many of them “do” contain errors & contradictions in them, we have to use caution about basing our beliefs on
them, especially the ones whose authorship is questionable. And as far as the anonymous writer of Hebrews goes: 1) early ECF’s believe it was written by Paul, and even if it wasn’t: 2) it was written during the time of the apostles who could verify it’s authenticity as being God-breathed, because it contained the same godly attributes that both the OT Scriptures, as well as the already recognized NT Inspired Scriptures, like Paul’s & Luke’s, did.