The Scriptures to which the writers of the NT referred were the Septuagint (LXX), the Greek translation of the OT complied around 200 BC. It was the most commonly used because very few people spoke the Hebrew in which the OT had been written but everyone spoke Greek. The LXX contained the apocrypha.
The concept of "inspired, inerrant scripture" is a modern one developed in reaction to the very liberal interpretations of many leading modern scholars and which led to the "Fundamentalist" movement of early 20th century USA.
The early church based it's determination on NT canon in part on apostolic authorship which resulted in the Didache being excluded because, though containing apostolic teaching, it was not the work of any specific apostle.
So when people start talking about what is "inspired" and what is not, for the most part, they are speaking from a lack of information. It is far from the "cut and dried" results so often offered as irrefutable fact. It is a bit arrogant for any man to declare "God hath said this but not that."
But you don't have to read the if you don't like them. I don't care much for "Numbers"; I find it tedious. And I don't spend much time with the Revelation since it is John's best effort at rendering his ecstatic, apocalyptic visions into human language. Because of the ambiguity of his visions, it, as well as Daniel's apocalyptic, ecstatic visions, Revelation has been used by a wide variety of charlatans to fabricate astounding and wonderful new ear-tickling new winds of doctrine.
iakov the fool