The issue of human or divine authorship depends on how we understand the inspiration of Scripture. This is a complicated and nuanced topic. Many evangelical Christians don't understand it very well, and non-Christians certainly don't.
As
Michael Patton says:
Michael Patton writes:
Much time will be spent on the commonly held view of inspiration called Mechanical Dictation. It will be argued that this view evidences a neglect of the human element of Scripture, what we call biblical Docetism, and is the primary hindrance to proper interpretation in many evangelical communities today. Most basically stated: without a proper view of inspiration, one cannot have a proper hermeneutic. The goal of this lesson is to provide a detailed defense of what is often called the Verbal Plenary doctrine of inspiration.
There is a theological analogy between the written Word of God (the Bible) and the living Word of God (Jesus). Just as Jesus was both fully man and fully God, so the Bible's authorship is both fully human and fully divine. Every word in the entire Bible was inspired by God ("verbal plenary" inspiration). But (nearly) every word and sentence was also composed by a human author, and his cultural mileau, human limitations, and personal style shine through.
My answer to the OPs question is "both".
"Science without religion is lame, religion without science is blind." — Albert Einstein
I am very astonished that the scientific picture of the real world around me is very deficient. It gives us a lot of factual information, puts all of our experience in a magnificently consistent order, but it is ghastly silent about all and sundry that is really near to our heart, that really matters to us. It cannot tell us a word about red and blue, bitter and sweet, physical pain and physical delight; it knows nothing of beautiful and ugly, good or bad, God and eternity. Science sometimes pretends to answer questions in these domains, but the answers are very often so silly that we are not inclined to take them seriously. — Erwin Schroedinger
™ Version 4.2
