Adam and Eve, were the first modern humans with two centers of consciousness; both an inner self and an ego. Modern humans have two centers of consciousness. The inner self is older and is common to all the animals. It is the center of the unconscious mind and animal instinct and what defines each species in terms of consciousness behavior; human nature is common to all humans.
Before Adam and Eve, humans were closer to advanced natural animals, with only an inner self. The ego is much newer, it is only 6-10K years old instead of hundreds of millions of years old like the inner self of dinosaurs. The ego is what allowed civilization to form; secondary POV, that disconnected from natural instinct.
The early symbolism of Adam and Eve in paradise is about the period of time when they were governed by their inner self and natural instinct. The ego appears more with the tree of knowledge of good and evil. It offers will and choice apart from the inner self. As you read Genesis, beyond the story of Adam and Eve, humans become unnatural and perverted, due to the ego will and choices and loss of instinct from the inner self; experimental time.
Adam and Eve symbolize a major update of the human brain's operating system, to form a new type of human who could develop civilization. The first civilization appear between 6-10K years ago. This is where the modern human ego appears. Evolution only looks at the DNA, with human DNA older than 10,000 years. Adam and Eve had human DNA, but they also the major brain update that led to the loss of natural instinct and the rise of a replacement, civilization.
Have you ever asked yourself why did humans suddenly stop their migratory herding and wandering and then suddenly go a through an invention stage that would alter 100,000 years of previous behavior; settle and build civilizations. It was a brain update. This is why the formation of Adam and Eve is not done biologically, since it is more about software and not hardware. Adam come from the dust of the earth; from natural instinct. Eve is a clone of Adam; stem cells from one of his ribs; semi-biological with human modification. After the fall their sons are biological; genealogy. Cain was a tiller of the soil and Abel was herder of animals. When Cain kills Abel farming supersedes migratory herding; DNA change into two centers and civilization appears.
My theory is this change had to do with the relationship between humans and dogs, with dogs the first domesticated animal. Both had been apex predators who formed a relationship and became partners before their mutual domestication. Each learn from the other and added new advantageous behavior that were not part of each other's natural instinct. Each became more than their natural DNA, and its innate inner self from the migratory days. Domestication of dogs was somewhere between 12,000 to 30,000 years ago. Not much later, human advanced very quickly; brain update. A subroutine formed beyond the inner self, which would consolidate into the modern ego secondary center; secondary organic AI.