The "dead flesh" was and is the "dead flesh" of the descendants of Adam.
The same dead flesh he inherited from his mother Mary. It leads all the way back to when it was first corrupted from Eve. God corrupted the whole creation.
The Father of the Lord Jesus Christ is God Himself (i.e. no corruption in the Lord Jesus Christ).
No corruption in the unseen quickening Spirit .It's what he according to the one time demonstration poured out on the corrupted aging flesh of the Son on man.
It would seem you forget we walk by faith the unseen eternal, not after what the eyes see the flesh, the temporal not seen.
1 John informs us those avenues lust of the eyes, and lust of the flesh, pride of life are not of the Father but are natural of this corrupted world..
Joel 2:28 And it shall come to pass afterward, that I will pour out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions:
You do realize, garee, that in new heaven and new earth, we will have fleshly bodies? We shall walk in holy Jerusalem (Rev 21:10-24) … we shall be servants (Rev 22:3) … we will see His face (Rev 22:4) … we shall enter in through the gates into the city (Rev 22:14) …
Yes as sons of God which we are, it does not appear what we will be .Its the hope of Jehovah Witness that things will continue as they are .
Just as Peter in John 20. This is when Peter the denier spread the lie that John would remain alive in a body of death. Jesus revealed to Peter if every time he had to warn those who are looking for nothing to change something .The books that could be written would not fit into the libraries of the world.
We walk by faith the unseen spirit of faith the eternal not after the flesh seen the temporal. This is shown by the law of faith below.
2 Corinthians 4:18 While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
Our new incorruptible bodies will be neither male not female, Jew or gentile. Corruption does not inherit the incorruptible (.new elements as rudiments) Not a rebuilt or reconditioned creation. But created entirely new. Not after the dead corrupted rudiments of this world.
The former things (flesh and blood after the rudiments ) will not be remembered or ever come to mank fore ever more . Many simply do not desire that kind of salvation and look to the flesh .
Isaiah 65:17 For, behold, I create (not rebuild) new heavens and a new earth: and the former shall not be remembered, nor come into mind.
Our new family will be glorious. . . reflecting His glory which is now hidden under the Sun.