As to God's involvement in every book of the Bible, yes, they were all INSPIRED by God.
As to the “finger of God” writing the 10 Commandments, good point! However, we do not have those stone tablets, do we?
Which probably explains why we have more than one version of the Ten Commandments!
That's nonsense...Even Peter recognized Paul's writings as Holy Scripture...Paul carried around his books and parchments...
Paul addressed specific people about specific events and problems.
More nonsense...
2Ti 3:16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
Rom 9:33 As it is written, Behold, I lay in Zion a stumblingstone and rock of offense: and whosoever believeth on him shall not be ashamed.
So that one was just for the Romans, eh???
It is very much likely that a great many of Paul's letter were never preserved, at all.
All of Paul's letters are scripture...All of them were preserved...God said He would preserve His scripture...God didn't let that decision rest with His church, or your Church...