Antoine, your posts cover a large portion of Christian theology, which you seem to overlay with biological evolutionary outlooks; I do not think Gen 9:3-6 serves your purpose, and I feel that a detailed response may require a very lengthy response from me. In this case, I prefer to make my point with poetry, and to this end I provide the following (with poetic license):
Romans 7:18-20 For I know that nothing good dwells within me, that is, in my flesh. I can will what is right, but I cannot do it. For I do not do the good I want, but the evil I do not want, is what I do. Now if I do what I do not want, it is no longer I that do it, but sin which dwells within me.
Once man disobeys the Divine Will
He is impure, therein dwells sin,
No longer to commune with God
Mankind stands alone.
He who felt that the choice was his
Now looks with longing at the gifts
Wonders how it was lost;
Perhaps offence comes before repentance.
Adam felt sorrow, Eve no less.
But it was being deprived of luxury and ease
That sorrowed the parents of mankind.
God covered their shame
Did not bring them hurt nor blame
But warned them of life’s mishaps.
Lest they should now seek eternal life
Angels with swords of fire
Guarded the entrance from where they came.
Adam and Eve entered a land grown wild
Working for their food
Waiting and hoping each day anew.
History dawned when Adam and Eve sinned
Mankind continued adding sin to sin;
Cain killed Able
From envy and spite.
He could not bear.
He prayed for God’s mercy;
The earth would not sustain him
For he polluted the earth with his deed
All men would wish to kill him;
Becoming a wonderer amongst mankind.
They took any women they desired
Becoming sexually depraved
God’s Spirit saw vice and brutality,
Brother treated brother with cruelty
Corruption increased with every new born
Until Satan considered earth his new home.
God was sorry he had made mankind
The Eternal One sent a flood
To destroy mankind
He saved the good man Noah.
Yet each generation continued in evil
The ways of mankind were the ways of the devil.