An interesting larger question is posed here. When do mere writings become scripture? If we think back to the New Testament, the epistles, written by the church leaders, were adopted as scripture. Some made it, others did not.
Why? What is the criteria? I can’t believe it is human populism (greatest acceptance by the population).
You will have very many nights of interesting reading if you pick up a book on the Nicene Council or any good book on the history of Christianity. The battle of the bible, as I call it, was one helluva cold war. Also, read some of the Apocryphal gospels (they are available on the net), and compare them to the canonical gospels. You will see a striking difference and give you confidence the Council knew what it was doing.