Regardless of what you might think of the theological content, "scribblings of desert tribesmen" is an absurd characterization.

Is the Book of Job a mere "scribbling"? How about Ecclesiastes? How about the whole notion that human beings have overriding moral responsibilities regardless of wealth or social status?

Is there much early poetry more skillfully polished than the Psalms?

Scribblings (like "Surfin' Bird") aren't very interesting.