God Placed Adam in Eden
There were many trees in the Garden of Eden, but just two trees had eternal consequence. After he disobeyed God by eating of the tree of the Knowlege of Good and Evil, Adam's state was like a branch that was just cut off from a tree. Though he didn't look dead after he sinned, his immediate and end state was inevitable. Adam immediately needed life again just like we do (i.e., being in Adam) before we are saved.