What I think to be the main story of Genesis (the fall) is one of maturation. The childish and innocent Adam and Eve learn the knowledge of good and evil for themselves, here exemplared by the symbolic act of eating the apple. They become aware of their sexuality.
Yet god the father had ordered them not to eat of the apple and gain the knowledge. How are they punished? They are sent from their home and from their father's direct care but not his love. Eve is punished by the bearing of children and all it entails and they must work to care for themselves and bring forth their own children.
The story of the fall is the story of becoming an adult and doing what adults do. The fall of Adam and Eve from grace is the same fall we all take. We grow, we learn and we leave our parents behind. Stories like Genesis remind us that others have gone on before and not to fear the path.
That's what myth is. It is a grand stage on which the smallest dramas of life are played out for us. In the end, Genesis, like all myths, is teaching us how to be human and that there is no finer thing to be.
The problems arise when the dressing is mistaken for the meal. It is not that there was a garden and an apple, but that we all lived in the garden and ate the apple, if we are adults. Assuming literal truth for these grand and powerful tales and to not understand what they are really telling us is to demean them. It is classic case of not seeing the forest for the trees.
This is not a direct reply to Crash, but I've typed it out and don't want to change who I'm replying to.