This is completely a sidenote. If there was no physical death before Adam, then how does one reconcile Genesis 3:22 when God says "The man has now become like one of us, knowing good and evil. He must not be allowed to reach out his hand and take also from the tree of life and eat, and live forever". That verse indicates that physical death was not exclusive to a post-sin environment. A post-sin physical death model would seem to downplay the importance of the tree of life, especially given the stress of "he must not be allowed to live forever". This verse actually supports what NT Christian generally accept: that Adam sin imposed a new death penalty, that is, the penalty of spiritual damnation.