I have heard others say this, but in actuality, the resurrection of the body with a full restoration of the memories and personality traits, would still be you.
What if I were to tell you that every cell in your body is replaced every seven to ten years.....that process of cell renewal means that there is not a cell in your body that was there ten years ago....is that a clone of you? Or are you still you? God does not need a single molecule of the old body to create a new body and give it everything that made you who you were. If you recognise yourself, and others do too, how is it not *you*?
I believe that who we are is not just physical flesh and bones. We are our personality, character, memories, reasoning powers, etc.. That is not a physical thing. People who suffer from dementia can loose all their memories, intelligence, etc.. I saw it happen to my father, whose mind seemed to go in reverse, so that he degenerated back into a small child like person, unable to communicate. Who he was had disappeared. Will he be resurrected as that baby like person, having no significant personality and no memories of his former life. I hope not!
Some people liken us to a computer. The body is like the computer hardware, and the mind, who we really are, is like the software. The software is not physical; it has no mass. The computer without the software cannot function, but the software can be copied and put into other computers, and they will all perform the same and seem to be identical - clones. If the original computer hardware is destroyed, the other computers will nevertheless seem to be the same to us (some perhaps may have better hardware, but they will still function the same). Which one of those multiple computers is the real original computer?
Paul wrote, 2 Corinthians 5:1-8 (WEB):
(1) For we know that if the earthly house of our tent is dissolved, we have a building from God, a house not made with hands, eternal, in the heavens.
(2) For most certainly in this we groan, longing to be clothed with our habitation which is from heaven;
(3) if so be that being clothed we will not be found naked.
(4) For indeed we who are in this tent do groan, being burdened; not that we desire to be unclothed, but that we desire to be clothed, that what is mortal may be swallowed up by life.
(5) Now he who made us for this very thing is God, who also gave to us the down payment of the Spirit.
(6) Therefore we are always confident and know that while we are at home in the body, we are absent from the Lord;
(7) for we walk by faith, not by sight.
(8) We are courageous, I say, and are willing rather to be absent from the body, and to be at home with the Lord.
So for Christians, although our human body will eventually be dissolved (perished), God will (in the resurrection) give us a spirit being body, similar to Jesus' current body, and we will live forever in heaven with him. He seems to be saying that we are clothed with a physical human body, that we can be unclothed (dead, unconscious and without a body), and that we will be clothed with an immortal spirit body. That sounds like what we actually are can exist even when the physcial body dies, but when the body dies who/what we are exists in an unconscious state, described by Jesus as a sleep. It could remain like that, it could be made conscious again and given a new body (physical or spiritual), or God can permanently destroy it.
In verse 2 above, the word translated habitation (or house) is
oiketerion, which is the same word used in Jude 1:6 (KJV):
(6) And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.
This is refering to the angels mentioned in Genesis 6:2 (WEB):
(2) God’s sons saw that men’s daughters were beautiful, and they took any that they wanted for themselves as wives.
These angels left their heavenly position and came down to the earth, leaving their spirit body "house" or "habitation" and taking on a physical human body (male). It seems that angels too can be clothed with a spiritual or physical body. Demons too want to take possesion of human bodies (or dwelling place). So it seems reasonable to me to suppose that we too are similar to the angels (after all, we are made a little lower than the angels - Psalms 8:5, and Jesus also was made a little lower than the angels when he was made a man - Hebrews 2:9), so that the essence of who we are is not physcial, but spiritual. That's my best guess. :)
Matthew 10:28
(28) Don’t be afraid of those who kill the body, but are not able to kill the soul. Rather, fear him who is able to destroy both soul and body in Gehenna.
Gehenna is a place of eternal death....both body and any prospects for future life are “destroyed” in this place. It is a place from which no one returns. God determines who is sent there.
My point was that there is a distinction between body and soul, and only God can destroy the soul, but the body can be killed much more easily.