After the biblical author concludes his presentation of the myth of the emergence of archetypal man and his moral autonomy, he continues to elaborate on his central theme. He presents another myth that purports to explain the origins of social conflict, the disruption of the natural harmony between man and his fellow. He does this by continuing the general story line of the Garden of Eden myth, describing what took place after the expulsion from the garden. At that point, Adam and Eve began their struggle for dominance with nature and the building of human civilization, without the benefit of providential intervention.
4:1. And the man knew Eve his wife; and she conceived and bore Cain, and said: “I have gotten a man with the help of YHVH.” 4:2. And again she bore his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.
Once man internalized the prospect of his personal demise, he came to understand that the potential for human immortality would be realized only through the continued regeneration of the species, rather than through the immortality of the individual. Since the Creator clearly did not intend to create any additional human beings by divine fiat, it was up to Adam and Eve to initiate the process of human procreation.