Not true at all. There was a TON of debate during I believe (don’t quote me on this) the Council of Nicaea over which books were supposed to be Canonical or not. Just as an example, I know there was a ton of debate over the second letter of Peter. Why do you believe that? And nowadays it is a generally held opinion that Paul didn’t write Hebrews, yet it’s considered a Pauline Epistle. Why do you think Hebrews is inspired Scripture? There is also a fair amount of evidence that the Apostle John did not, as was originally believed, write the Gospel According to John. Why do you believe that? And anyway, why are other Christians’ judgments necessarily right?