David Plotz is an agnostic, and he gave the Bible a careful reading.
His experience is recounted at Slate here.
I came to the Bible hoping to be inspired and awed. I have been, sometimes. But mostly I’ve ended up in a yearlong argument with God. Why would He kill the innocent Egyptian children? And why would He delight in it? What wrong did we do Him that He should send the flood? Which of His Ten Commandments do we actually need? Yet the argument itself represents a kind of belief, because it commits me to engage with God.
As I read the book, I realized that the Bible’s greatest heroes—or, at least, my greatest heroes—are not those who are most faithful, but those who are most contentious and doubtful: Moses negotiating with God at the burning bush, Gideon demanding divine proof before going to war, Job questioning God’s own justice, Abraham demanding that God be merciful to the innocent of Sodom. They challenge God for his capriciousness, and demand justice, order, and morality, even when God refuses to provide them. Reading the Bible has given me a chance to start an argument with God about the most important questions there are, an argument that can last a lifetime.
In spite of his JACOB WRESTLING THE ANGEL ambivalence towards the Bible, Plotz nevertheless offers this opinion concerning its “cultural literacy” value:
Not to sound like a theocratic crank, but I’m actually shocked that students aren’t compelled to read huge chunks of the Bible in high school and college, the way they must read Shakespeare or the Constitution or Mark Twain.