The label 'Gods word' is taken out of context by you guys. You seem to think every little word was whispered into Pauls ear by God, therefore its Gods actual word.
The Bible is human thought with Divine insights, forever entwined to help the reader understand God. I'm guessing it would have been unimaginable for Matthew, that future Christians would take his writings so literal that they would argue where he put his comma or claim he meant 'little pebble' when referring to Peter.
Dude, they already taught the faith once. Its done. It flowed from their mouths. Things like what the Eucharist is, were clearly and irrefutably explained.
There is no doubt they passed on their authority to successors too. These successors created a NT Bible 400 yrs later and added it to the Hebrew books they considered sacred scripture. The Church is still standing today.
Just as Moses was given direct inspiration on the mountain Paul and the other apostles were given direct inspiration by Jesus who breathed on them.
John 20:22 "And when he had said this, he breathed on them, and said to them, Receive you the Holy Ghost:"
The apostles who wrote the NT books were inspired to do so. Every word.
The early Christians quoted these books in the 38,000 letters we have to know which books they considered inspired scriptures long before Rome ever accepted the canon.