i'm a child of God and I don't die, though my flesh does perish. I was born inside of God and so how do you think that those born of God can die?
Rom 8:5-17 (YLT)
For those who are according to the flesh, the things of the flesh do mind; and those according to the Spirit, the things of the Spirit; for the mind of the flesh is death, and the mind of the Spirit--life and peace; because the mind of the flesh is enmity to God, for to the law of God it doth not subject itself, for neither is it able; and those who are in the flesh are not able to please God. And ye are not in the flesh, but in the Spirit, if indeed the Spirit of God doth dwell in you; and if any one hath not the Spirit of Christ--this one is not His; and if Christ is in you, the body, indeed, is dead because of sin, and the Spirit is life because of righteousness, and if the Spirit of Him who did raise up Jesus out of the dead doth dwell in you, He who did raise up the Christ out of the dead shall quicken also your dying bodies, through His Spirit dwelling in you. So, then, brethren, we are debtors, not to the flesh, to live according to the flesh; for if according to the flesh ye do live, ye are about to die; and if, by the Spirit, the deeds of the body ye put to death, ye shall live; for as many as are led by the Spirit of God, these are the sons of God; for ye did not receive a spirit of bondage again for fear, but ye did receive a spirit of adoption in which we cry, `Abba--Father.' The Spirit himself doth testify with our spirit, that we are children of God; and if children, also heirs, heirs, indeed, of God, and heirs together of Christ--if, indeed, we suffer together, that we may also be glorified together.
this is talking about spiritual life as opposed to worldly life:
Eccl 9:4-6 (YLT)
But to him who is joined unto all the living there is confidence, for to a living dog it is better than to the dead lion. For the living know that they die, and the dead know not anything, and there is no more to them a reward, for their remembrance hath been forgotten. Their love also, their hatred also, their envy also, hath already perished, and they have no more a portion to the age in all that hath been done under the sun.
the livings love, hatred, and envy die because they are born from above and receive the things of God. they receive no more from the age of this world but they receive from heaven (as a new creature) and they grow in spirit and in truth.
therefore God favors those born of the spirit and not those only born from the flesh. when we are born again we live our lives in this world for God and we become pleasing to Him.
the bible is a religious book, not a scientific book. first and foremost it has to do with the inner life of God and of man. the bible speaks on many levels, that is the nature of the wisdom of God who orders all things for our good.
the deads memory perishes because they die to themselves and love God and do not seek after rewards for God is their reward and they have him. that is why Jesus told us that we must pick up our cross and follow him.
here is shown the second adam who is alive in Christ and dying to himself.
"the living know that they will die..."
here is shown the first adam who is dead in sin.
...but the dead know nothing;"