Orion said:
Ecclesiastes 12:7
Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
What does God do with all the spirits when they return?
When are these spirits created?
Which part of us, is the spirit? Do we control it? Is it who we are?
MY COMMENTS: Good questions, Orion. Are you interested in doing a word strudy on "spirit"?
It takes work, but it is rewarding.
I can give a short summary of my research, and hopefully you can do more research.
Indeed, "the Lord God formed man from the dust of the ground, breathed into his nostrils the breath (neshamah--Hebrew) of life, and man became a living soul." Gen. 2:7
NOTE: "neshamah" is "breath"; "ruach" is "spirit" or "wind, etc" depending on the context.
Man's SPIRIT may be defined as his life force, and is related to breath.
(Don't think of man's Spirit as if it were a separate entity which lives on after he dies).
As long as man is breathing, his life force exists; when he stops breathing, his life force ceases to exist, and is said to return to God who gave it (Eccl. 12:7)
In Zech. 12:1 we are told it is "the Lord... who forms the spirit of man within him."
This is true of all air breathing creatures:
"I am going to bring floodwaters on the earth to destroy all life under the heavens, every creature that has the breath of life in it." Gen.6:17 NIV, etc.
"All in whose nostrils was the breath (neshamah) of the spirit (ruach) of life, of all that was on the dry land died." Gen. 7:22
"In his hand is the life of every creature and the breath of mankind." Job 12:10
"If it were his intention and he withdrew his spirit (ruach) and breath (neshamah), all mankind would perish together and man would return to dust." Job 34:14-15
THUS: we see that man's spirit (life force) is related to breath---not that his spirit is only his breath.
I would say our spirit, our life force, is in our whole body, for as we breathe the oxygen is carried to all our parts via our blood.
Answering your other questions, hopefully: NO, we are not "spirit" or "a spirit".
Certainly, man is a complicated creature. As to "controlling our spirit", there are passages which seem to indicate such, for they describe feelings to man's spirit:
Bitterness of spirit (Gen.26:35).
Pharoah's spirit was agitated (Gen. 41:8).
The spirit of Jacob...revived (Gen. 45:27).
Anguish of spirit (Ex. 6:9)
Being filled with the spirit of wisdom (ex. 28:3).
A willing spirit (Ex. 35:21).
God hardened his spirit, and made his heart obstinate (Deut. 2:30).
Their spirit was abated toward him (Judg. 8:3).
Hannah...a woman of hard spirit (1 Sam.1:15).
The broken of heart, and the crushed [bruised] of spirit He saves (Psa. 34:18).
Renew a right spirit within me (Psa. 50:10)
There are many more. I see the relationship of man's heart and spirit.
Here are a few from the Greek Scriptures:
Happy in spirit (Mat. 5:3).
A willing spirit (Mat.26:41).
Paul's spirit was stirred within him (Acts 17:16).
Apollos...fervent in spirit (Acts 18:25).
The Spirit... is testifying...with our spirit that we are children of God (Rom. 8:16).
There are many more, but you can look them up.
I hope this helps.