I will post my view on the scripture...
1. Sin is death, Adam and Eve sinned against God by doing something against what he commanded, thus opening the doorway to sin in our world. If they did not go against God then there would be no sin, no death.
Now we have our Savior Jesus Christ who saves us from this Sin-Death, before Christ God required of his people to make sacrifices to satisfy his judgment so they can be saved.
2. This story in Genesis should not exactly be taken literally, the Garden is a symbol of paradise, Gods perfect creation before sin (death) entered the world "do not eat of this tree" symbolically shows that God made one law that he wanted Adam and Eve to obey... it may not be literally a Apple Tree.... The snake represents Satan and his temptation, Adam and Eve fall into temptation "their eyes were opened" - They discovered evil, Sin awakens...(death) "you will not die" Satan convinces them that Sin does not lead to death, which sin does lead to death as God said.
Adam and Eve get the boot from the garden... Sin leads to a world of pain, so the paradise they once had was gone and now is in a world corrupted by sin, that’s another symbolic view. "Angel with sword"-A sinful being cannot enter paradise.
Just a thought....
Evanescence