I have commentaries on Genesis at home that I will try to consult tonight, but...did the serpent sin before Adam and Eve? Sin didn't enter the world through the serpent, it was the transgression of man - specifically to the law that they may not eat from the tree of knowledge. The serpent did not eat from the tree, but was still cursed by God for his involvement. It would that if the serpent was purely metaphorical, then why was it cursed along with Adam and Eve? Each of the curses are then addressed through the second Adam, Jesus Christ, being reversed through His righteousness and obedience, but not that of the serpent - unless I'm missing something. All things were created by God and declared good, so based on that declaration, it would seem that the serpent belonged in the Garden, but it does seem interesting and perhaps worthy of further investigation, that the serpent apparently remains cursed, unredeemed through the economy of the Son, unless it is Man, who through his fulfillment of the command to be master of the created world to also redeem the serpent...? Perhaps this is the sanctification of the world itself? dunno