Note: All Scripture quotations found in this article are from the text of the Authorized King James Version of the Bible.
Every individual that has taken their first breath has a soul inside their body. Their soul has a bodily shape according to the Bible. Notice in the below verses that the soul of the rich man had eyes, fingers and a tongue.
Luke 16:23 "And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom. 24 And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame."
The Bible also teaches us that like bodies, souls can wear clothes.
Revelation 6:9 "And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:"
Before the new birth, our soul is stuck to our body. Leviticus 5:2,4; 7:18 and 23:30 show a soul can touch a physical thing, swears with physical lips, eats a physical meal and works outside. All these verses show that by using "body" and "soul" interchangeably it reveals that the soul is stuck to the body.
The Bible also says that in the Old Testament, whenever a saint sins in his body (Rom. 6:6, 12-13), his soul also sins (Ezek. 18:4,20). Because that his soul sins, he will go to Hell (Ezek. 3:20, John 8:24, Rev. 21:8). The New Testament saint, whenever he sins in his body (Rom. 6:15, 7:17-25), he is still freed from sin (Rom. 6:2,7,18,22), therefore he will not go to Hell (Rom. 6:3-7, Rev. 21:8). The difference is that the New Testament saint's soul is separated from the body at Salvation.
Colossians 2:11 "In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ: 12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead."
Before Adam fell, it is possible (not 100% sure) that Adam's soul was lose from his body (not spiritual circumcision, just already loose). Even if it was joined to the flesh, it would not have mattered because Adam's flesh was without sin until the fall (Gen. 2:7). When Adam fell, his spirit died (Eph. 2:1-4) and his soul and body was wedded together (Rom. 7:25). No one was circumcised with the circumcision made without hands until Jesus Christ sent the Holy Spirit to this earth in Acts 2:1-4. That explains why Abraham had to get a real knife and do it himself (Gen. 17). Abraham's salvation was a type of our salvation (Rom. 4:4-12), but nothing happened to him when he got saved (Gal. 3:6-9).
When a man gets saved his body dies to sin (Rom. 6:6-8) and his spirit is Born Again (John 3:3-7). This is what sets a man free and makes it to where even though he sins, his sin does not affect his eternal security, since his flesh cannot defile his soul (Gen. 19:20, Lev. 22:6). Paul explains about spiritual circumcision as still living in the flesh, but he recognizes he is not of the flesh.
Romans 7:24 "O wretched man that I am! who shall deliver me from the body of this death? 6 Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin."
An example of the spiritual circumcision would be an ice tray. When one pours water in the ice tray and puts it in the freezer to freeze the water, the ice cubes get stuck to the tray. Then when you take them back out and break them lose from the tray, the ice cubes are no longer part of the tray. The ice cubes are free from the tray. Compare that to the spiritual circumcision where the soul breaks lose from the body at Salvation and is no longer part of the body.