Suppose that a person of ordinary intelligence and no particular belief about God were to sit down and read some scripture. Suppose then &mdash since I've been hitting the old bong a lot lately — that this scripture is chock full of deep, profound, sensible content. Then that person would believe the scripture for the wrong reasons: She would believe it because it made sense.
A lot of books have deep, profound content that an intelligent reader believes because it makes sense, because the text is rationally persuasive. What distinguishes specifically religious texts, though, is that the content isn't rationally persuasive on its own merits, it persuades because the reader has faith that it's true by God's authority.
Without that dependence on God's authority, wisdom is just wisdom. We're entitled to conclude that the human author might be wise, or knowledgeable, or learned, but if the text is rationally persuasive on its own merits, there's no need to invoke God. Wise people might not be a dime a dozen, but they're more numerous than deities.
The more you persuade me that some scripture is sensible, is rationally persuasive on its own merits, the more you persuade me that the scripture is not actually scripture, which needs God's authority to be persuasive. Scripture has to be illogical, irrational; it can't make sense on its own.