Religion

Since that Canon became the official scripture of the RCC, it has been pretty much universally accepted by Christianity of all denominations. With very few exceptions, it is the official story. That there are other extant writings doesn't really alter that fact.

As an atheist, I'm looking at all religions from outside of them. I take each at its own declaration. The accepted scriptures are what interest me, since they form the foundation of that religion.

There are fragmentary and disputed additional writings, of course. Not as many as there once were, I suspect, though. The ones we have available probably still exist because they were not known at the time the Canon was set in stone. Given the authoritarian point of view of the Constantine church, I would be very surprised if contradictory manuscripts or documents were not destroyed during the process of creating the Canon. Either that or secreted away in inaccessible archives.

There was a process.