I think your asking if transgression created the flesh ? The physical existence of mankind ?
I would say that transgression corrupted the body , corrupted what God had already created and set it on a miscourse Because he gave us free will, and stewardship of earth.
the body was created by the lord from the earth and the knowledge of good and evil was forbidden , and then the knowledge of good and evil corrupted the body and we have the term flesh.
we were already physical already like Jesus resurrected body , and we partook of a curse and became like we are now born under sentence of death. The gospel is about restoration of what was taken in the beginning
when he created man he placed then in the garden and gave them the right to the tree of life then they transgressed
“And the Lord God said, Behold, the man is become as one of us, to know good and evil:
and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
Therefore the Lord God sent him forth from the garden of Eden, to till the ground from whence he was taken. So he drove out the man; and he placed at the east of the garden of Eden Cherubims, and a flaming sword which turned every way, to keep the way of the tree of life.”
Genesis 3:22-24
that was not Gods will his will was for them to be in Eden with him and live
Jesus is about restoring what was taken
“He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.”
Revelation 2:
this is only one example but he restores what Satan took away in the beginning
there are two realms of creation the earthly and the heavenly . We have to forms of body earthly and heavenly not flesh and blood reference here
“There are also celestial bodies, and bodies terrestrial: but the glory of the celestial is one, and the glory of the terrestrial is another.
It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
And as we have borne the image of the earthy, we shall also bear the image of the heavenly.
Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.”
1 Corinthians 15:40, 44, 49-50
flesh and blood can’t inherit but we have two forms the flesh and the spirit . Flesh is about a corrupted body , being born again promises a heavenly body
we aren’t what we were , what we are going to be is what we were meant to be before transgression