How are spirits born?

Although I am technically a Baptist, I study the Scriptures for myself and draw my opinions from them, and not from any Denominational interpretation.

I will give you what my understanding is concerning the Spirit as I understand the Scriptures.

All Scripture is quoted from the King James translation unless otherwise noted.

Genesis 2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.

To begin with lets start by defining what the three parts of man (and woman) are:

Body

this is what God formed out of the dust of the ground, but it is just a lifeless mass at that time.

Soul

This is the immortal component created by the breath of God which he breathed into the lifeless form he had made from the dust.

Spirit

There is no reference to the Spirit in the account of God creating man.

The first reference to spirit is in Genesis 1:2 and that refers to the Spirit of God.

According to Strong that word was:

רוּח, rûach, roo'-akh; From H7306;

wind; by resemblance breath, that is, a sensible (or even violent) exhalation; 
figuratively life, anger, unsubstantiality; by extension a region of the sky; by
resemblance spirit, but only of a rational being (including its expression and 
functions): - air, anger, blast, breath, X cool, courage, mind, X quarter, X side,
spirit ([-ual]), tempest, X vain, ([whirl-]) wind (-y).

This would appear to be the characteristics of the person which are formed by life experiences.

The Spirit of man then would not be present at formation, or for modern understanding conception. It would be in the case of man an ever changing thing as more and more things were experienced, and that may be the reason Spirit was not mentioned in the creation of man. We may have better insight into this from these Scriptures:

Exodus 28:3 And thou shalt speak unto all that are wise hearted, whom I have filled with the spirit of wisdom, that they may make Aaron's garments to consecrate him, that he may minister unto me in the priest's office.

Exodus 31:2 and 3 See, I have called by name Bezaleel the son of Uri, the son of Hur, of the tribe of Judah: And I have filled him with the spirit of God, in wisdom, and in understanding, and in knowledge, and in all manner of workmanship,

From these two passages, I have come to believe that Spirit is interchangeable with experience. Please correct me if I am wrong.

From the following Scripture I glean that there are both good and evil Spirits:

Leviticus 20:27 A man also or woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones: their blood shall be upon them.

These have apparently abandoned the teachings of the Spirit of God and opted for the teachings of the Spirit of Satan.

Luke 4:33 And in the synagogue there was a man, which had a spirit of an unclean devil, and cried out with a loud voice,

When we accept Christ we lose our old evil Spirit and gain the Spirit of God;

Matthew 10:19 and 20 But when they deliver you up, take no thought how or what ye shall speak: for it shall be given you in that same hour what ye shall speak. For it is not ye that speak, but the Spirit of your Father which speaketh in you.

These are the conclusions I have reached in my studies, and there is much more that can be said about the Spirit, But to me the thing that is important is that God has a purpose for every person he places in the womb, and he in his perfect knowledge knows how each Spirit will develop and what ones will accept him.

The Soul is that part of man which once established is eternal. Once established it will continue to exist in perpetuity. The Spirit and Soul are the two elements of human existence which will either spend Eternity in Heaven with God or in the lake of fire with Satan. The soul then is that part which given by the breath of God is that part which is Eternal and makes the Spirit eternal.

Genesis 2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.

The soul is given to man when God breathes the breath of life into man, whether that is at conception or at physical birth is the contentious argument on which abortion is based. Most Christians believe that that is at conception, and therefore abortion is killing a living Soul. We are somewhat comforted by the fact that that soul never attained a spirit and therefore will not be subject to the eternal wrath of God.

Together the Soul and Spirit will either experience the Grace of God or the wrath of God.

Why would the Spirit experience the wrath of God? What would be the purpose of punishing the Soul for eternity if it had no memory of being informed about the Grace of God and yet rejecting that free gift of God?

Revelation 20:14 and 15 And death and hell were cast into the lake of fire. This is the second death. And whosoever was not found written in the book of life was cast into the lake of fire.

The body will return to Dust, but the Spirit and soul; one established by God himself and the other established by man, will live for eternity. It is not the Soul that condemns us to eternal punishment it is our Spirit, (or the knowledge that the grace of God was offered to us, but rejected.), that brings on eternal wrath of God. The soul unlike the body and spirit is strictly a spiritual gift from God and it can be either a good or bad gift depending on the actions of our minds once we know the grace of God is available to us.

Hope this helps.