I don't understand it. I don't even know why it would matter except as some ham-handed attempt to reject science that scares those that claim it.
Biological evolution is centered on DNA and natural selection. My belief is the stories of Genesis is not talking about the physical body or changes connected to human DNA. Rather its is more about the appearance of human will and choice, which can act apart from natural human, genetic based, instincts.
Man in the image of God, was more about the point in time when the brain exceeded its genetic program, and free will appears. An analogy, would be like a computer becomes conscious, and starts to exceed its program; will and choice. Before that change, it follows the program; instinct, but after the change, things will never be the same.
Will and choice, exceeding the natural program, changes human evolution, away from natural selection, to manmade selection. This change in the brain and consciousness is what Genesis is really talking about. Both sides of the classic debate evolution and creation, are setting the wrong stage. Both are arguing, body, instead of mind. Neither can grasp that consciousness can and did exceed its DNA program, at a certain point in time, not to long ago based on the evolutionary time scale.
Adam is symbolic of this change in the human mind and consciousness, where natural selection no longer fully applies to humans. Today we can tweak the DNA directly, in the lab, allowing the mind to lead the DNA. We can even modify the DNA, not by natural selection, since lab gear is not natural, but via man made selection; corn with wings.
This premise of mind over matter is how both sides can agree. Evolution sets the early stage of evolving life, leading to humans appearing and advancing by natural selection. While Genesis are stories from a time when there was change in the human brain and mind; computer become conscious and willful. This then becomes problematic. Not everything we can choose, will end well, after human lose their natural instincts.
My theory is that written language and the formation of sustained civilization, which both occurs in the Genesis time scale; carbon dating, set the stage for the change; Adam. Civilization caused humans to live in man made environments, which broke the full connection to nature and natural selective pressures. While writing caused repression due to forcing the memory to retain and refresh information, beyond its natural brain course of forgetting and/or forward integrating.
Written law of good and evil was especially troubling to the natural mind, since once it was written; cast in stone, it was hard to move forward, due to man made selection, causing repression. Like in the Middle East, old time grudges, written on tablets, do not end. This is not how the natural human brain worked, before written language.
If you look at the details of Genesis it gives a rare look into the past, so we know where we came from; modern man.