A few things. First, Adam and Eve died, not because they sinned, but because their access to the "Tree of Life" was revoked. According to the Genesis narrative, God said to Adam "“in the day that you eat from it you shall surely die.” but we know he didn't drop dead that day he ate the fruit, meaning the death God must have been referring to is spiritual death.
Yes, Adam died spiritually to God, and mankind inherited his new nature of Satan, a sin nature. And, yes, God had to protect them from eating of the Tree of Life to save them and mankind. God, Himself, performed the first sacrifice of blood for Adam and Eve when He killed an animal and made garments of its skin. They still had free will, so made and taught their children to make sacrifices to God and their obedience would have been imputed righteousness.
Jesus is different because he didn't have access to the Tree of Life and no one does at the moment, except for maybe Jesus himself, since the general resurrection has not occurred yet. However, the way I know that Jesus' soul and spirit died, contrary to Jesus never sinning, is not only because Isaiah 53:10 says so, but 1 Peter 3:18 can be understood as a spiritual resurrection of Jesus, which would explain how he could preach to spirits in prison prior to a bodily resurrection. That explains things satisfactorily in a way that doesn't require him be God.
I see it a little differently. Yes, he no longer had breath, part of the soul, but His inner being never died. It didn't have to. They already existed because of the seed of the Father.
Jesus answered and said to them, “Destroy this temple, and in three days
I will raise it up.” Interestingly, there are other verses implying that either the Holy Spirit or the Father raised Him from the dead. But the three are one. All the Word who is God emptied Himself of to become flesh was his glories, not His inner soul and spirit.
What must happen to mankind is both our soul and spirit must be born again of Christ's Spirit to destroy in us the works of Satan which is our bondage to sin which Jesus never had. Being tempted was on Satan, not that Jesus could have "second thoughts" to do evil. Satan tempting us is not our sin, but his. We just must not consider the temptation, dwelling on it for then you could be overcome bringing it to its fruition, sin. Read James 1:14-15 and notice
when it becomes sin.
So the matter of how Jesus died spiritually since he never sinned. We need to come at it from a slightly different angle. Begin with the question, why does Revelation 20:14 say "Then death and Hades were thrown into the lake of fire. The lake of fire is the second death." Death and hades received the soul and spirit of a sinless man, something death and hades are not allowed nor designed to do, and in doing that these non-person things (death and hades) sinned, too, and, thus, will be destroyed as sinners well, but not yet. Eventually, death and the realm of the dead will no longer be allowed to legally exist. That's the loophole that I believe God exploited, not by using Himself, but by letting a sinless man die, but not the body only, but the spirit and soul as well. Just my take on it. I do believe that all of Jesus had to be sacrificed for the atonement to be possible and permanent.
Hell was not made for mankind. Only for immortal beings such as Satan and his demons. Hell is eternal. The dead spirit and soul of the lost in mankind are not there yet? They will also be raised, but judged. When their names are not found in the Book of Life, then at last they will be thrown in the Lake of Fire, and because they will not have access to the Tree of Life, they will be destroyed putting an end to Death and their prior home, Hades, the outer darkness where they had been found weeping and gnashing their teeth.
I already showed you Psalms 139. Did you think that is only for the Father? That may be part of your confusion on thinking that Jesus went to hades as just a man and that is why his dead spirit and soul could be there preaching to the dead who were lost in the flood. That's where you are wrong. Jesus is God and is everywhere. Only His body needed to die as a sacrifice for sin to shed its
blood. His Spirit was always eternal having no beginning or end. This is why Jesus could see Nathaniel when he was alone under the fig tree. It is how Jesus saw Satan fall like lightening to earth as if it was in the past, not future after Calvary, Revelation 12:10.
I hope you will think hard about this alternative to your scenario.
