These are speculations I have read over the years. Some of the Jewish faith believe the two stories of creation are based on the creation of mankind's spirit and the second based on mankind's physical existence. The Garden of Eden is actually Paradise, or the garden thought to exist outside the gates of heaven where God 'walked'. Here Adam and Eve made a choice for physical existence where they might experience both good and evil, learn good and evil, thus becoming more like God who chose goodness.
Adam means man and Eve, mother. One author speculated that for the sake of a story, tribes were reduced to a singular person. Adam, the tribe of man, had many people, both men and women. As the tribe grew, new tribes were formed--Cain, the tribe of farmers; Abel the tribe of shepherds. The animals were ravaging the farmland which infuriated the farmers and the first war broke out, with the tribe of Cain slaughtering the tribe of Abel. The larger tribe, Adam, banished the tribe of Cain from the area. Later the tribe of Seth merged from the tribe of Adam.
I learned these possibilities when I was still quite young, but both caught my attention and stayed with me.