The point being that God does not judge us as evil for having lusts and desires, but only for what we actually perform, whether good or bad.
Newborn babies have fleshly lusts, but have done neither good or evil, and are therefore not judged as sinners.
You miss the point every time. You have a flawed definition of "sinner," because you don't accept man's sin nature. Therefore your definition discounts any definition that would give credence to that view.
A sinner is who is a sinner by nature, not simply one who sins. That is what you fail to see. A lion is one by birth. He doesn't become a lion when he starts DOING things that lions do. He is born one. Jeremiah illustrated this perfectly:
Can the Ethiopian change his skin, or the leopard his spots? then may ye also do good, that are accustomed to do evil. (Jeremiah 13:23)
--The nature of the Ethiopian was to have black skin, not white. In no way could he change it.
--The nature of the leopard was to have spots, not stripes. In no way could he change it.
--The nature of man (from infancy onward) was to sin. In no way could he change it. He will always have a sin nature. He can't rid himself of it until the redemption of our bodies, or when Christ comes again. We are sinners by birth. This is what Jeremiah is teaching us, as well as a whole lot of other verses.
Thus a sinner does not become a sinner by DOING evil things. He is already a sinner. He was born that way. Now that he has a sin nature, he sins by nature, though he will still remain responsible for his sin.
New born babies have DONE neither good nor evil.
It doesn't matter what a person has done. They were born sinners. The DOING has nothing to do with it. They were born sinners. That is the teaching of Jeremiah 13:23, the teaching of which is absolute. Ethiopians beget by nature black people (black by nature). Sinful people beget sinful people (sinful by nature).