My current take on the Bible can be pretty much summed up by the story of the Good Samaritan...
It's an enduring illustration/story that makes an interesting and worthwhile point. I've seldom seen/heard arguments over whether there actually was a good Samaritan. The actuality of the characters doesn't seem to be the main point anyway - it's the story, based on what at least could have been an actual occurance (set in a historical backdrop), that resonates.
Jesus spoke in illustrations; as the Bible implies, he seldom spoke without them. Then why can't the OT also be very illustrative? Why can't the Genesis account of Adam and Eve and the Flood be illustrative rather than fully based on historical occurance? Maybe the OT God YHWH is "speaking" in illustrations, telling us meaningful stories without expecting that we believe such things actually occured. Or perhaps they are loosely based on some actual events - the Flood for example could be based on a significant flood that may have occured in the Mesopotamia area and became the stuff of legend.