The fall of Adam and Eve was a lost opportunity, not a fall from a perfected (completed) state.
And what was that opportunity? The opportunity to ³prove themselves faithful (full of faith) and gain true knowledge of good and evil through faith filled (i.e., faithFUL) obedience - instead of seeking to be there own god and using the forbidden tree to gain (take) that knowledge by disobeying God and His direction.
Christ - The perfect (and ⁴perfected) God/man - learned obedience (faithfulness) through the things he ¹suffered. It wasn't that Christ was disobedient (unfaithful) and became obedient (faithful). He was faithful (without sin) throughout His life but he went from untested to tested obedience (faithfulness).
And unlike Adam, who failed the test to not eat from the forbidden tree in the garden, Christ passed multiple tests with flying colors - from his first ²temptations in the wilderness to his facing and accepting his death sentence in the garden of Gethsemane (Christ's garden - in contrast to the garden of Eden where Adam and Eves faced their tempation) right before He was betrayed, to embracing the cruelist death imaginable (physically, spiritually, and emotionally) through his crucifixion for us.
Christ's reward for passing His tests? Resurrection (for Himself and us) and the total defeat of death by bearing our condemnation for our unfaithfulness!! He defeated death and gained resurrection not only for Himself but for all those who put their total trust in Him?
Death came to humanity by the rebellion of first Adam but life came through the faithful obedience of the second Adam.
By raising Christ, God declared that life had the last word, not death!
“... looking to Jesus, the founder and perfecter of our faith, who for the joy that was set before him endured the cross, despising the shame, and is seated at the right hand of the throne of God...” - Hebrews 12:2 ESV
“Therefore it says, “When He (Christ) ascended on high, He led captivity captive, And He bestowed gifts on men.” [Ps 68:18] (Now this expression, “He ascended,” what does it mean except that He also had previously descended [from the heights of heaven] into the lower parts of the earth? He who descended is the very same as He who also has ascended high above all the heavens, that He [His presence] might fill all things [that is, the whole universe]). ”
Do you trust Him!?
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Footnotes:
¹self denial is a form of suffering and a death to self fulfillment.
²the lust of the eyes, lust of the flesh, and the pride of life. The same three tests that Adam and Eve gave into and failed.
³Keep in mind that God had appointed and entrusted humanity to develope and rule the earth on His behalf. This was humanity's high calling and one they had likely thought about and what skills and knowledge they needed to carry out their assignment.
To fulfill this task they also needed to prove they were trustworthy of doing so i.e. would they carry out the assignment for God's honor or only for their gain. This is why there were two trees in the garden and the serpent was allowed to approach them i.e. these were part of their "entrance exam" to see if they were qualified to carry out the assignment God had given them.
“And God blessed them. And God said to them, “Be fruitful and multiply and fill the earth and subdue it, and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth.”
And God said, “Behold, I have given you every plant yielding seed that is on the face of all the earth, and every tree with seed in its fruit. You shall have them for food. And to every beast of the earth and to every bird of the heavens and to everything that creeps on the earth, everything that has the breath of life, I have given every green plant for food.” And it was so. ” - Gen 1:28-30 ESV
⁴Christ was the second Adam sent to fulfill the needed faithfulness to qualify them so they could complete the task that Adam and Eve were appointed to do but falled.