It's like Lord Jesus said ...
John 3:6-7
6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
7 Marvel not that I said unto thee, Ye must be born again.
KJV
If you don't believe you have a 'spirit' inside your flesh that is not of... flesh material matter, then there would be nothing to be "born again" by The Spirit through Faith on Christ Jesus. Your belief on Christ would mean nothing.
It is the soul that dies spiritually and physically. Since the soul does not change, the spirit and the body changes. The spirit is eternal and cannot die. It is the God part of the image. The body is the Word and physical Jesus part of the image. The soul is the Holy Spirit part of the image. God keeps the spirit, His part of the image in His presence in heaven. The corruptible body from Adam has to die and return to dust. But our soul is the pneuma part, having form, but no substance. The cloud without any hardware. The soul does not "need" a body, but without one how does it experience anything? God gives (all) the Holy Spirit inside to seal the innermost part of this pneuma cloud. A physical body covers the soul, and gives us the experiences that shape and mold who we are. The spirit is an outer robe that we currently lack. A demon is a former outer robe, that now seeks residence where the Holy Spirit is and smothers the ability of the Holy Spirit and takes over control of the heart and mind, the emotions and thoughts of the soul.
To maintain the whole, spirit, body, and soul in the Word of God, maintains the spirit in God's presence. It keeps the flesh from sinning, and it allows the Holy Spirit to control the soul. Pagans incorporate the soul and spirit (as one) in their thinking and that is reflected in the parts of the Bible pre-Greek, and shows post Greek influence. That is not how God set things up. One has to be careful using Job and Ecclesiastes as proof text. Both incorporate pagan thoughts, because the writer or character being written about is thinking like a pagan.
Jesus is correct about the two births. They involve the flesh, body on earth, and the spirit, outer robe with God. Since all souls, in Adam have a dead sinful body, and are separated from their spirit because of sin, the soul needs the two births. It is symbolic not that we literally have to go back into the womb. The soul is constantly longing for both births. If we currently have our spirit with us, it would make Jesus a liar, and the spiritual birth not necessary. God is not physically present in the aspect of our spirit. If that happened we would shine bright like a star. Daniel 12:1-3
“When that time comes, Mikha’el, the great prince who champions your people, will stand up; and there will be a time of distress unparalleled between the time they became a nation and that moment. At that time, your people will be delivered, everyone whose name is found written in the book.
2 Many of those sleeping in the dust of the earth will awaken, some to everlasting life and some to everlasting shame and abhorrence.
3 But those who can discern will shine like the brightness of heaven’s dome, and those who turn many to righteousness like the stars forever and ever."
This is when the spirit is returned to the body and soul, and we will literally shine like a star. Now we are forced to say, both births are being withheld to a future event. Some even claim it is the GWT. Some say it is the Second Coming. Some spiritualize the process saying it is both now and physical, it is practical (idealistic) belief, and not literal at all.
I accept Paul in 2 Corinthians 5, and John in Revelation 6, and their description of both births. Paul mentions both in 1 Corinthians 15, and further clarifies the physical birth in 2 Corinthians 5.
Some have been taught that heaven and Paradise are spiritual and not physical at all, as a false paradigm between the divine and the carnal flesh. The heavens are just as physical as the rest of creation. The earth is just as spiritual and held together by God as what is under the earth and in heaven above the earth. We as sinners just have a veil of darkness blinding us from the full spiritual glory of God's creation as a whole. As modern humans, we have been deceived by Satan to view God's spiritual and physical creation as a virtual universe with a 14 billion year shape and existence. We cannot even grasp the reality of what God created in Genesis 1. Genesis 1 is completely foreign and contradictory to what we are taught growing up. That is why no one can reconcile science with God’s Word. The Second Coming will change all that and expose Satan's deception.