Thanks mP for a very thoughtful and considered post. In your version of Genesis there are shades of what I read in a previously mentioned book by Denis Alexander called "Creation or Evolution - Do We Have To Choose?" Alexander posits that Adam and Eve were symbolic of a group of humans, specially selected by God out of many evolved humans living at that time for a unique relationship, the hallmark of which was their introduction into agriculture in contrast with their contemporaries, who were still primitive hunter gatherers.
Regardless of how you choose to explain it (and there are hundreds of possible explanations) my point all along is that you can't explain the first three chapters of Genesis without resorting to allegory, which you demonstrate in your own post (i.e. this means that, and this is symbollic of that). I maintain that, surely given the gravity of the events in Genesis and their impact on the human race, these things should have been more clearly stated in simple terms. For example, Moses was well acquainted with the concept of sin having penned the mosaic law for the Israelites to adhere to. Why is sin not mentioned at all in the first three chapters of Genesis?
Cedars