[1]Jesus was fully God and fully man.
[2]Jesus never sinned, But He became sin for us when He took our sin and gave us God's righteouness.
Thats why He died Spiritually and went to hell, He did it so we can be born again and not have to go to hell.
[3]It is God who says Jesus dies Spiritually, And He has recorded it in the Bible.
[4]You are trying to understand the trinity with your carnal mind, And the Bible says it is a mystery.
[5]You quoted Col 1: 18., "Jesus was the firstborn fron the dead".
That alone tells us that Jesus died Spiritually, Because He wasn't the first to be raised from physical death, People in the old testament were raised from the dead, And Jesus raised the dead,
So Col 1: 18 tells us the Jesus was the first to be raised from Spiritual death, [The first to be born again].
[6]When Jesus said, "It is finished" He didn't mean redemption was finished, Or the debt is paid in full as you say.
The Greek meaning for, "It is finished", Is, Jesus carried His physical death through, He was saying His physical pain was finished.
We know redemption wasn't finished because Paul tell us that Jesus had to be raised from the dead to compleate redemption.
1 Cor 15: 14--18.
[7]If there was no need for Jesus to suffer in hell, Why does God say He did??.
Acts 2: 24 tell us that God loosed Jesus from the pains of death, But God didn't loose Jesus from the pain of physical death DID HE??.. No..NO.. Jesus died.
But God did loose Jesus from the pains of Spiritual death when He raised Jesus up Spiritually,
He was made alive in His Spirit. 1 Pet 3: 18.
He was the first to be born again, Col 1: 18.
[1]Spiritual death is seperation from God,
There are lots of people who aren't born again and therefore seperated from God, [spiritually dead], But they are still physically alive.
When Jesus said, "My God why hast thou forsaken Me", The Greek meaning is, "To Leave, To abandon, To forsake".
Jesus knew the emptiness of the absence of God when He Spiritually died, But He was still very active in His Spirut'soul, As he was being tormented in Hell Acts 2: 24.
After He was Spiritually made alive, [Born again] 1 Pet 3: 18,
He proclaimed the victory over the devil and the spirits, 1 Pet 3: 19.
All this was before He was physically raised.
[2]The reason Jesus call dead people, "Sleeping", Is because thier bodies are at rest like a sleeping person.
At death, Only the body dies, The Spirit/soul lives on in the place we have chosen while on the earth.
Our bodies are our earthly suites, It is just the shell that we live in, We are a Spirit who has a soul, "The mind will and emotions" and we live in a body until it dies.
At the resurrection those who have died will get a new glorified body, those who go up in the rapture, will be changed into a new glorious body, One that will last for all eternity.
