I amnot separating but, God gave us bodies at the time and place of His choice.
Did we exist before our bodies?
Heb 2:14¶
Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
We know Jesus had a body prepared for Him
Heb 10:5¶
Wherefore when he cometh into the world, he saith, Sacrifice and offering thou wouldest not, but a body hast thou prepared me:
No, there is no existence before being "formed in (the) mother's womb."
Philosophy would separate the body from the soul and spirit. However, one cannot have such a separation and function. Which is why when the believer casts off this old body in what is called death, they have been given that new body which is "like His."
Now, "...It does not appear what we shall be, but we shall be like Him..."
Christ is God. God has always existed. So of course a body had to be prepared for Him. Humankind are not from eternity past, but each is formed by the will of God according to His design and designated purpose. As God formed Adam and breathed into him never ending life and took from Adam and formed Eve. However, in the Scriptures there is limited information as to how this all took place and the function of each.
There is Scripture that state that only God can separate them. (Hebrews 4:12)
There is Scripture that state that God preserves and discerns each. (1 Thessalonians 5:23)
There is Scripture that state that God demands complete devotion of all "parts." (Matthew 22:37)
There is Scripture that states that there is an eternal body and soul that can be cast to hell. (Matthew 10:28)
Which brings us to the next part of your post.
but our body does not sin, our soul sins.
We have been taught they are equall, They are not, Jesus said to cut off the hand if it could offends The flesh is tempory and for the only purpose for the salvation of mankind through Jesus's shared death
you will agree the soul exist without the body.
Who said our body does not sin?
If the body does not sin, why would the Lord point to parts of the body that need to be controlled, as you mentioned in your post?
The flesh sins. (Ephesians 5:6, Romans 7:25)
From the very core of who a person is (referred to as the heart among the Europeans, the bowels in the middle asians...) come the sexual sins, the murders, the evil thoughts and musings...
I do not agree that the soul exists without a body. Rather, the Scriptures indicate that the soul leaves this body of corruption and is given a new incorruptible body. (1 Corinthians 5)
Now a personal note:
Should the Scriptures have given more information about how all the "parts" (soul, mind, body, spirit...) fit and worked, taking each part and intricately explaining how each is formed and for what purpose and how the fall impacted them differently, then this attempt at separation might have some traction.
But that is not the presentation of the Scriptures.
The Scriptures are not specific, and when they are not, then it is not given to humankind to demand a specific. It is enough that the Scriptures present the person as a complete package, formed by God for God's purpose.
For the believer, there is this struggle of wills that takes place. That struggle between the will born of the flesh, and the will given by God at the new birth that one day inhabits the new body.
It is not evil to philosophize as long as it is not attempting to establish what is beyond the Scriptures, but merely musings and intellectual wondering. But be careful that the wondering does not transform into something that can be held as the truth. Only what is Scriptural is what is the truth and in the matter presented in your post the Scriptures do not give specific information in such a manner as to extend beyond the basic statements that there are parts, that they are intricately connected, and that sin infests all of it.
