Death, where is your sting?

"Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned - for until the Law sin was in the world, but sin is not imputed when there is no law." -Romans 5:12-13

"Then the Lord God took the man and put him into the garden of Eden to cultivate it and keep it. The Lord God commanded the man, saying, 'From any tree of the garden you may eat freely; but from the tree of the knowledge of good and evil you shall not eat, for in the day that you eat from it you will surely die." -Genesis 2:16-17

"Then the Lord God said, 'Behold, the man has become like one of us, knowing good and evil; and now he might stretch out his hand, and take also from the tree of life, and eat, and live forever' - therefore, the Lord God sent him out of the garden of Eden, to cultivate the ground from which he was taken. So He drove the man out, and at the east of the garden of Eden He stationed the cherubim and the flaming sword which turned every direction to guard the way to the tree of life." -Genesis 3:22-24

Observations...
Romans 5:12 indicates that death entered the world because of sin
Romans 5:13 indicates that the possibility of sin requires 'law'
Genesis 2:16 indicates that God commanded that Adam and Eve not eat from the tree of the knowledge of good and evil
Genesis 2:16 is not "the Law," (the law given to Moses), but is sufficient law to make sin possible
Genesis 2:16 only forbids ONE tree: the tree of the knowledge of good and evil
Genesis 3:22, God observes that man had taken from the tree of the knowledge of good and evil, and was now "like one of Us" (Us = trinity).
Genesis 3:22 God says, "now he might stretch out his hand and take also from the tree of life, and eat, and live forever"
Genesis 3:23 God sent Adam and Eve out of the garden
Genesis 3:24 God stationed angels and a flaming sword to guard the garden of Eden, "to guard the way to the tree of life"

Thoughts...
Okay...so through man, via sin, death entered the world. Does this mean physical, or spiritual death? I have always assumed it was referring to physical death. But today something made me re-think that. In Genesis 3:22-24, God sends Adam and Eve out of the garden of Eden, ***so that they would not be able to eat from the tree of life***. Now, God had never before commanded Adam and Eve not to eat from the tree of life. The fruit of the tree of life was free for the taking. In Genesis 3:22, God indicates that the tree of life would have caused them to live forever........If there was no physical death before sin...then what would the tree of life do? Why would God bar them from it, if they were already created immortal?...Or was there physical death before the fall? Were Adam and Eve given dibs on eternal life (the tree of life was not forbidden!), and ate from the tree of the knowledge of good and evil instead?? Was there the possibility of physical death in the garden of Eden?...C.S. Lewis wrote, in The Screwtape Letters, from the perspective of Screwtape (a fictional ally of Satan), that Satan and his followers must work to keep us humans believing that physical death is a bad thing. Was he onto something? Do we mistake physical death for spiritual death? Spiritual death is, by all definitions, a BAD thing to bring on yourself. Spiritual death eternally separates us from God. Physical death is completely different. Physical death, in a sense, transports us from the physical world, to the spiritual world (Don't worry, I'm not getting all weird on you). Now think about it...because of sin, physical death MAY transport us to either Heaven, or Hell. If we are bound for Heaven (those who have accepted Christ's sacrifice and forgiveness, and are seen as sinless), physical death is not actually a bad thing! If we are bound for Hell (those who have not accepted Christ's sacrifice and forgiveness, and are seen as sinful), then physical death is a very bad thing, as it is quite literally the point of no return! However...in a sinless world, what would death be? If you're like me, you automatically just thought, "But there isn't death in a sinless world. Romans 6:12-13 says that death came through sin!" Okay, but what kind of death is Romans 6:12 referring to? Physical death, or spiritual death? If it is referring to physical death, then the garden of Eden must have been free of physical death. But if it is referring to spiritual death, then physical death (which, remember, is not a bad thing for the sinless!) could have been a part of the garden of Eden. Consider this - why would Adam have to till the ground, if there were no way the plants would die?...why would there be a tree of LIFE, if there were no death?...why would God give Adam and Eve free access to the tree of Life, if they were already immortal? Would there be any point to a tree of Life, if Adam and Eve COULDN'T die? If there were physical death in a sinless world, that death would be a pretty exciting event! Sinless humans would understand that death is simply a trip from physical earth, to spiritual Heaven! Did God create mortal, perfect humans, so that He could watch the amazing process of life, birth, and death? Did He allow death? Was life a beautiful cycle that began on earth and ended with a one-way trip to Heaven? Was death originally a glorious occurance? A good thing, which like many good things, has been perverted by sin?...Or am I completely off...What do you think?