There's no division. You can"t seperate flesh from the man. The whole man is forgiven. The flesh either dies or is transformed into an incorruptible body at the lord's return
I think it’s a misunderstanding of this part of doctrine
“Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
That which is born of the flesh is flesh;
and
that which is born of the Spirit is spirit.”
John 3:5-6 KJV
“
It is the spirit that quickeneth;
the
flesh profiteth nothing:
the words that I speak unto you, they are spirit, and they are life.”
John 6:63
“For
he that soweth to his flesh shall of the flesh reap corruption;
but
he that soweth to the Spirit shall of the Spirit reap life everlasting.”
Galatians 6:8 KJV
“For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.”
Galatians 5:17 KJV
We are conflicted we have been since we broke the commandment
“And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat: but of
the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.”
Genesis 2:16-17 KJV
“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:
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
The conflict manifests within us like this
“And the LORD said,
My spirit shall not always strive with man,
for
that he also is flesh: yet his days shall be an hundred and twenty years.”
Genesis 6:3 KJV
And so the answer is
“For
if ye live after the flesh, ye shall die: but
if ye through the Spirit do mortify the deeds of the body, ye shall live.”
Romans 8:13
“And they that are Christ's have
crucified the flesh with the affections and lusts.”
Galatians 5:24 KJV
and we return to the source so we understand the terminology being used
“
It is the spirit that quickeneth;
the
flesh profiteth nothing:
the words that I speak unto you, they are spirit, and they are life.”
John 6:63
“This I say then,
Walk in the Spirit,
and ye shall
not fulfil the lust of the flesh.”
Galatians 5:16 KJV
Flesh and blood isnt evil it is the way man is tempted , our weakness
“For when they speak great swelling words of vanity,
they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error.”
2 Peter 2:18
“among whom also we all had our conversation
in times past in the lusts of our flesh, fulfilling the desires of the flesh and of the mind; and
were by nature the children of wrath, even as others.”
Ephesians 2:3 KJV
“But put ye on the Lord Jesus Christ, and
make not provision for the flesh, to fulfil the lusts thereof.”
Romans 13:14
Jesus set this doctrine in place but Paul later really explains it well mankind is conflicted between the lusts of the flesh and the Will of the spirit . The flesh lusts for things contrary to the spiritual things it’s always a conflict we’re being pulled in two directions