Progressives and Scripture

Thinking through the usual "Progressive" (liberal?) emphasis on progress... 

In that worldview, those who wrote the Bible would have been rubes (relative to us), intellectually and morally. But if one is familiar with the intricacies of the Bible (granted, a rare thing, even among Christians), at least the former is untenable. 

Two seemingly famous examples: 

1.) From the Bible, we can't identify the first sin committed by Adam and Eve. The mental wrestling-- and the quality of the potential reflection and instruction-- resulting from this ambiguity is really cool. 

2.) Can you name the first sin committed by Noah after coming off the ark? (The common answer is something that a rube could imagine. I can't imagine a rube writing what turns out to be the correct answer.)