If you actually read from some of the historical transcripts from the time the canon was selected, then you would know that what I wrote in my last post is true. There are some good books that cover this, and the best I read is by Dr. Hanson (Anglican) in his book "Tradition In the Early Church". In one of the chapters he covers why and how that process took place, and the fact that it took the church almost 100 years to make the selection should tell anyone that it was a difficult and contentious process. It's an old book, but Hanson heavily documents that process, including a great many quotes.
BTW, another excellent book is Introduction To the Bible" by Dr. William Barclay (Anglican). Unfortunately, the last time I checked it was out of publication.
Here's just a brief on this as found in Wikipedia with a link:
The process of canonization of the New Testament was complex and lengthy. In the initial centuries of early Christianity, there were many books widely considered by the church to be inspired, but there was no single formally recognized New Testament canon. The process was characterized by a compilation of books that apostolic tradition considered authoritative in worship and teaching, relevant to the historical situations in which they lived, and consonant with the Old Testament. Writings attributed to the apostles circulated among the earliest Christian communities and the Pauline epistles were circulating, perhaps in collected forms, by the end of the 1st century AD... --
https://en.wikipedia.org/wiki/New_Testament
Notice even what the first line says. Also, there are about a dozen or so paragraphs that will clearly show anyone in brief how and why this process took so long and was so contentious.