For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.” 2 Peter 1:21. It was the Holy Spirit who inspired the prophets. Doesn‟t this prove that He is the author of the scriptures and therefore a divine being?

Answer:

The scriptures were indeed given by the Holy Spirit. Peter plainly explains the identity of the Spirit that inspired the prophets:

“Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you: Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow.”
1 Peter 1:10, 11

This is a wonderful testimony to the truth that Jesus Christ is the author and finisher of our faith. The scriptures were inspired by His Spirit and are therefore the testimony of Jesus Christ. Spirit of Prophecy:

“The Saviour had spoken through all the prophets. "The Spirit of Christ which was in them" "testified beforehand the sufferings of Christ, and the glory that should follow." 1 Peter 1:11.” {DA 234.1}

“The blessed Bible gives us a knowledge of the great plan of salvation, and shows us how every individual may have eternal life. Who is the author of the book? -- Jesus Christ. He is the True Witness, and He says to His own, "I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of My hand."” {FE 308.2}