But you disagree with this because 1) you believe Adam and Eve already knew good and evil, and 2) you don't believe the fruit of the tree of life was literal.
the fact that Eve was able to inform the serpent of the law and the consequences of the law shows that they did have knowledge of it.
So when Genesis says 'they have become like God knowing good and bad' we believe it means that they had become like God in that they became 'self determined'... prior they were dependent on God for guidance, but by disobeying, they were rejecting Gods guidance and deciding for themselves what they will and wont do.
God is the one who sets all laws and standards and he has the right to do so. The man and woman were not in a position to act independently of Gods stated laws....but thats what they did when they chose to eat the fruit. To this 'knowing good and bad' means they began to set their own rules and standards....they set themselves in a position that only God has the right to be in....so now they had 'become like God'
and yes, the tree was symbolic of what was possible for them if they remained in the garden with God as their ruler.... but now they had lost that potential.
But you disagree with that again because you believed the tree of life was a figure of speech.
the reason why the tree is symbolic is because revelation, Ezekiel and Jeremiah all speak of the 'trees of life' that become available during Christs millenial reign.... and during that time, mankind will have the opportunity to live forever again. But whoever rejects God during that time can still die as is seen by what happens at the end of the millenial reign. So having these 'trees' does not automatically grant everlasting life even when people have access to them. Only God can grant everlasting life....hence the trees of life are symbols of what is on offer at that time.
Death was their appointed punishment, you agree with that.
Yes, Genesis says
'for dust you are and to dust you will return' .... The serpent told eve '
You will positively not die' He completely contradicted Gods warning about the tree. So who do you believe? The serpent or God? If you say we continue to live on after death in some form, then the serpent was telling the truth and God is a liar... We dont believe God lied to them when he said if you eat from it you will die. Thats why our belief is as the bible says
"the dead are conscious of nothing at all"...
"his spirit goes out, in that day his thoughts do perish"
Temporal= temporary. This is not saying that Christ was not needed. It was because of Christ that our deaths will be temporary. Do you believe that eliminating our temporal deaths would destroy God's intention for us to be happy?
You believe God is a just God, if men were not to die temporally, do you believe that would upset the demands of justice?
there will come the time when God says,
"death will be no more"
So obviously death is not necessary for us to be happy....in fact i think it makes us all pretty miserable.
Justice has been served. Jesus paid the price of our redemption from sin and death. He paid that price for every man woman and child who has ever lived or is yet to live. So if we believe firmly that Jesus is our redemptor, then we can understand how it can be possible that
"some will never taste death at all"
death is not going to be a part of our human condition for much longer... during Christs millenial reign, the potential for everlasting life will be freely available to all who return to God for curing
Revelation 22:1-2 
And he showed me a river of water of life, clear as crystal, flowing out from the throne of God and of the Lamb 2 down the middle of its broad way. And on this side of the river and on that side [there were] trees of life producing twelve crops of fruit, yielding their fruits each month. And the leaves of the trees [were] for the curing of the nations
9 Therefore, as the soul could never die, and the fall had brought upon all mankind a spiritual death as well as a temporal, that is, they were cut off from the presence of the Lord, it was expedient that mankind should be reclaimed from this spiritual death.
I am curious as to your belief on this one.
we believe what the bible says...It is very clear in stating that the soul is subject to death, saying:
The soul that is sinningit itself will die. (Ezekiel 18:4
So i cant agree with the writer in this regard... souls are living humans. Adam was created and when he came to life he was a 'living soul'
SOS means 'save our souls' ... .save our lives from the danger so we can keep living. Soul is not an immaterial part of man...it is the entire whole man.
And I am pretty sure you agree with this one am I right?
i dont know what the 'preparatory' or 'probationary' state means????