God did not create in people a nature that is sinful, fallen, or unredeemed. These concepts are not biblical. He created a nature that is 'human' and Jesus took that same nature.He had our humanity without sinful flesh and original sin. These came at the Cross.
The 'human nature,' which the Lord assumed, is composed of a 'human spirit' and a 'human flesh.'
"The flesh (Gr sarx) is not always evil in Scripture. Indeed, it is used positively in relation to sexual intercourse in marriage (Eph 5:31) – as well as for the sinless human body of Jesus (Jn 1:14; 1 Jn 4:2,3). Indeed, flesh (what is physical) is necessary for the body to live out the faith the Lord works in (Gal 2:20)."
Contrary to gnostic views (and Watchman Nee), the flesh in the NT is a morally-neutral life force (without which we cannot survive) and leads to desires (some are good and some are evil). This is explained in posts #34 and #109.
Joh 1:14 And the Word became flesh and lived among us, and we have seen his glory, the glory as of a father’s only son, full of grace and truth.
The evil desires are referred to in the Bibles with the words 'lust' and 'coveting.' Jesus had our 'human flesh' leading to good desires, as in Luk 22:15 but no evil desires (lust / coveting).