"but you must not eat from the tree of the knowledge of good and evil, for when you eat from it you will certainly die.
Did God really say, You must not eat from any tree in the garden?
2The woman said to the serpent, We may eat fruit from the trees in the garden, 3but God did say, You must not eat fruit from the tree that is in the middle of the garden, and you must not touch it, or you will die. 
4You will not certainly die, the serpent said to the woman. 5For God knows that when you eat from it your eyes will be opened, and you will be like God, knowing good and evil.
so what happened? I call upon God to testify:
And the Lord God said, 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. 23So the Lord God banished him from the Garden of Eden
Adam was mortal and God practically quotes the Serpent's prediction. Not one word about sin, disobedience, or death.
This works if you do not include Adam in the same group of people created on day 6.
This works if you accept the trees are magic.
This works if you ignore the fact that when Adam ate, he did disobey God. When God said you must not eat, was that a command? Sin is breaking one of God's commands. I thought every one accepted that. What I do not accept is that morality is being GOD like. Morality has to do with human relations and has nothing to do with God. Normally we do not sin against each other, because for the most part, no one is above the law, nor really has the authority to tell another person how to live. We can rule ourselves, but this comes from agreement, not having one human be our Lord.
If one thinks that learning what morality is, is being godlike, then it would seem that humans got life all wrong. We are not in the image of God because we ate, we were in the image of God before we ate, and now we are not. It is still separating Adam from the beings created on day six, and giving Adam his own creation experience separate from the others.
The command did not say you will die. It said you will certainly die. The word "certainly" seems to put a "disclaimer" on death. Is it an unnecessary adverb? In the Hebrew it is redundant usage of the word meaning "to die" Literally it said after eating to die to die. We normally do not think of it as dying twice, but that is the way it was written. That could be interpreted, that in order to die, one had to die twice. Is the first death the loss of mortality and then the second death was the actual death?
Did being in the garden grant immortality and leaving it make one mortal?
That makes sense to those who think that the Garden, and Promised Land, and the New Jerusalem were/are places where there was Heaven on Earth. But that means that God created an imperfect Adam that had to live in the Garden. That is still giving Adam his own separate creation. If you look at the Holy of Holies in the Tabernacle, and Temples that the Hebrews built, it was a special place where God allegedly appeared in full Glory. It would seem to make more sense that the Garden was such a place and God seemed to talk to Adam, Eve, and Cain as naturally as Eve talked to the Serpent and they all talked to each other.
I will throw another thought out there. There is the idea that Immortals could change their form. This would be noted in the fact that Satan an Immortal could take on the form of a walking talking Serpent. It would seem that he took on that form as showing his authority over Eve. I am not saying that Adam and Eve may have been more Naïve and lacked knowledge that the other's had. For some reason they were singled out and there was a lot of knowledge about who they were that was hidden from them. Or so it seems. Morality only being a part of knowing good and evil. Why would some one think that experiencing evil is a good thing? Is death and suffering good? We learn from experience, is a fact. Would we learn less if such experience was never bad? I suppose trial and error postpone humans from getting to the truth or finding out something and would give some longevity to life, as opposed to knowing everything without even experiencing it.