Second, I was concerned that you were not giving the human writers their due. God used the human writers. They did not act as oracles of Him. Contrast this with how Muslims believe that Muhammed received the Koran. He was but a transcriptionist.
Third, the Catechism of the Catholic Church states the following about inspiration and scripture:
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105 God is the author of Sacred Scripture. "The divinely revealed realities, which are contained and presented in the text of Sacred Scripture, have been written down under the inspiration of the Holy Spirit." 69
"For Holy Mother Church, relying on the faith of the apostolic age, accepts as sacred and canonical the books of the Old and the New Testaments, whole and entire, with all their parts, on the grounds that, written under the inspiration of the Holy Spirit, they have God as their author, and have been handed on as such to the Church herself." 70
106 God inspired the human authors of the sacred books. "To compose the sacred books, God chose certain men who, all the while he employed them in this task, made full use of their own faculties and powers so that, though he acted in them and by them, it was as true authors that they consigned to writing whatever he wanted written, and no more." 71
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This makes the point, as you did, that God is the author of Scripture. It also states, as I was emphasizing, that the men who wrote the books were "true authors."
I am willing to agree that we both have a point.
God inspired various prophets throughout the OT to be His instruments, and as such were moved upon by the Holy Spirit to write those OT books that became part of the fixed canon of scripture of the OT.
As is said in Hebrews 1:1-2 “In the past God spoke to our ancestors through the prophets at many times and in various ways, but in these last days He has spoken to us by His Son...”
Concerning the OT, God gave the canon of the OT to the Jewish people of OT times, and as such, they were the discoverers of those books that were canonical in respect to OT books.