Reba
Sinner saved by grace
Human pride prevents the soul from seeing the Truth of God's Word.The One Who created it was Moses.
He was followed by Joshua.
Then eventually Samuel.
Then Nathan.
Ultimately Ezra and Nehemiah.
Then finally someone anonymous finished the Old (Tenakh) Testament with Maccabees.
The apostles and evangelists (missionaries) of Jesus created the New.
That's who wrote it -- and created it. It was for the benefit of neophytes.
Whereas Moses was literate and a prolific writer -- for the benefit of the Hebrews after he himself was gone -- he wrote everything down, as did the prophets who followed him and kept charge of the manuscript which being written on parchment (lamb skin) needed to be recopied every hundred years or so.
On the other hand the apostles and evangelists of the New Testament were secretive and did not write everything down until St. Paul began writing his letters to the Greek and Roman churches. Then suddenly Peter got the notion he too should write something down, presumably before his execution at Rome, so his stepson Mark served as his scribe. Then Matthew not to be outdone wrote using Mark's "gospel" (good-message in Greek -- efagelion) as a guide. Much later Luke did the same referencing both Mark and Matthew. Then finally John wrote his.
Note that Eusebius discredited "Hebrews" and "Revelation" so you should not take either of those two too seriously.
Your arguments are as old as the Scriptures themselves yet God's Word continues. Nothing new since Satan told the first lie in the Garden of Eden.