I am happy to disclose my own understanding chap. I will condense it so as not to write novella, but more detailed specifics are available on request.
In the beginning Adam and Eve were created to live forever as subjects of Gods kingdom, they were to fill the earth and subdue it. On advice however, they rejected God as ruler in favor of being able to decide for themselves what is good and bad, thus choosing sin. Because they chose sin, they forfeited access to the tree of life and in turn they died within that very "yom" (translated - day) (remember God conditioned death in Eden "in the "yom" that you eat of the tree you will die")
So through one man sin entered the world. The wages sin pays are death, so as sin is inherited throughout the human population, we all owe a debt that is payable only in death.
Because Adam forfeited a perfect life, only a perfect man could repurchase us from that debt, so Jesus, aptly known as the second or last Adam lived and gave up his perfect life as fore-payment for our sins, so if we fulfill the requirements of subscription to his ransom, all those that exercise faith in him might not be destroyed but have everlasting life. He can restore us to perfection (washed clean in the blood of the lamb) and life on the Earth as he originally intended under his rulership.
So the ransom sacrifice to me, only makes sense if man was created and lost perfection. If Adam was not perfect, we could easily have sacrificed one of our own by way of repurchase.
References - Genesis 2:17, Genesis 3:22, Romans 5:12, Romans 6:23, John 3:16, Psalms 34:22, Psalms 37:11, Revelation 21,3-5, Matthew 26:28, Hebrews 9:22,1 Peter 3:18-22, Revelation 7:14
It could be described as speculation, but it is how I make sense of it all.