I agree that new birth removes sin. However, where we disagree is that the basic division between material versus immaterial has no further subdivision in the immaterial between "spirit" and "soul." Hence, I would apply your removal of sin to the "spirit" only but not to the soul. I believe man is a threefold being for three levels of consciousness:
1. Outer world consciousness - physical body and senses
2. Inner world consciousness - soul (intellect, will, emotions)
3. Other world consciousness - spirit
What has been born of the Spirit of God is "spirit" (Jn. 3:6) and thus His Spirit bears witness with our spirit we are born again (Rom. 8:16). Hence, what aspect of our nature has been cleansed from sin is our "spirit" but not our soul or body. The soul is the point of warfare between the spirit and body. The soul is where we "put on" the inclinations of our spirit and where we "put off" the lusts driven by the principle of corruption in our flesh. The body is still dominated by the principle of corruption or the law of sin is still at operation dominating it with a perverted lusts for natural cravings.
The soul (intellect and emotions as expressed by the will as the will serves only to express thought or feelings) is the battle ground of spiritual warfare between the regenerated spirit and this body of death.
I agree with much of what you wrote, though my post in this thread may not reflect it. I believe we are a dichotomy of substance, with a third "aspect" being our soul (psyche). The substance of a man consists of two natures - spirit and dust. Substance can fill a container. We could fill a bowl with blood, fill a box with bones, fill a trash bag with skin. Our immaterial substance is only immaterial to us. God can see our spirit, put our spirit into a body, or a trash bag if He wanted to. But the soul is not substance, it is "personality".
Soul = thoughts, emotions, will, rationale, memories, etc. You cannot have a bowl full of thoughts, or a basket full of emotions, or a box full of determination, a sack full of rationale, etc.
I think you might better understand my position if you read this thread:
http://www.baptistboard.com/showthread.php?t=91626&highlight=body+soul+spirit+personality
I totally reject this theory altogether and completely. God never created any living thing that simply reproduced PART of its kind - the physical part. Ephesians 2:2-3 repudiates your theory completely as prior to indwelling by the Spirit of God, demons operated "in" the children of disobedience. Thirdly, that is why the "spirit" needs regeneration and removal of sin because it is dominated by the presence and power of the spirits of disobedience - demonic. When natural man reforms himself, Jesus said "seven more SPIRITS" enter in and take up residence.
Natural Man is not an ongoing creative work of God. What is replicated in the process of reproduction after its own kind is the WHOLE man not PART man.
Finally, infants are born with a depraved nature and their responses prove it. You NEVER have to teach children to do evil or be completely self-centered - it comes naturally and that does not come naturally from a spirit without inclination to evil or good, but a depraved spirit that manifests itself in evil and selfishness as soon as it is capable of expression.
We do, in fact, only procreate the physical aspect of our being. Traducianism is not biblical, coming from Tertullian's misunderstanding of what Paul wrote in Romans 5:12-21. By the time Tertullian came around, the church had about 150 years of fighting against Gnosticism. And from what I have noticed, there is almost ZERO reference in writers before him as to any distinction between spirit and body. Why? Possibly because that was the common ground between true Christianity and Gnostic heresy.
Seems to be that they downplayed the commonality and focused on how the Gnostics perverted the nature of Christ and other issues. By the time Tertullian came by, he was looking for a way to understand Paul's words that all men were made sinners because of Adam.
You also have to consider that Tertullian was Latin, not Greek. He is, after all, called the father of Western Christianity. So he had a different mindset from which he was trying to understand Paul. He invented Traducianism, and it is altogether unbiblical.
So how is it that you don't have to teach a baby to do evil? Simple - they are procreated from sinful flesh, therefore they are born with all the evil inclinations of this corrupted aspect of every human ever born. But they have a sinless spirit which comes from God - Zechariah 12:1 supports this, as does Ecclesiastes 12:7. And God does not have corrupt breath
A baby's mind, however, is still developing. They are simply expressing whatever seems to influence them in the moment. You will see times where they display pure innocence, being driven from the inside. And they act upon it. Then at times, you see them being driven by what they sense with their physical body - what they see, hear, smell, touch, etc. They desire something in their corrupted body, and it overcomes their psyche. Then that's all they think about, then they act upon it