We get the canon from what was received and accepted by the Ekklesia, as ealgeone said. I ardently agree with that.
Then since the canon of Scripture that we see manifestly established as authoritative by the 1st century did not need an authoritative infallible church to tell them, and lacked the official authority and qualifications to determine who the itinerant Preacher from Messiah who also affirmed them was, then your "argument from authority" is contrary to how the NT church even began.
Go back an actually answer all my questions.