Wow! Love this question, P.
I cover some of this in my latest book, but I'll keep my answer relatively short, here. Almost midnight, so I'm a little sleepy too. So, bear with me.
One analogy I use involves a car which needs repair and which someone locks in a garage and puts the key away in a forgotten, "safe" place.
A traveling car repairman says that he can repair the car, but the owner denies that he even has a car. Therefore the car cannot be repaired.
Perhaps a better example would be someone with a broken heart. Denying the existence of the heart prevents it being repaired.
Genesis 1:26 makes it obvious that the Holy Ghost is us. The sons of God are immortal spirit (fallen) wrapped in Homo sapiens flesh. Denying the existence of the Holy Ghost makes it impossible to forgive one's sins. The repair cannot be done. Even saying nasty things about Jesus or God can be forgiven, if one admits that they have a spirit that needs repair.
Eternal life is a return to the continuity of consciousness of spirit we had before we ate the forbidden fruit. What? Us? Read Ezekiel 18:18–20 in the context of us paying for the sins of Adam and Eve. Something doesn't fit, unless you consider that Adam and Eve were us. We don't owe anything for their sins unless we were them.
Homo sapiens was created because we no longer had continuity of consciousness after the Garden. Try balancing your checkbook in your dreams. Not easy! That's how easy salvation is without a human body. Impossible.
And that's why God brought about Noah's Flood, because something threatened the rescue mission -- jeopardized the integrity of Homo sapiens and the future of civilization. None of God's children were hurt during the Flood -- only the bodies they wore.
Rod Martin, Jr.
"The Bible's Hidden Wisdom: God's Reason for Noah's Flood"