a naked man in edin (Enkidu) is separated from his herbivore animal companions by a naked woman (Shamhat of Uruk) and she convinces him to leave edin and replaces his animals with her companionship. She convinces him to eat forbidden food (bread and alcoholic drink) offered by edin's shepards. They leave edin clothed. He ceases to be an animal, now he has knowledge like a god, for in early myths man was naked and hairy (Berossus' account), man ate grass like a beast, had no knowledge of good and evil. Only the gods wore clothes and knew of good and evil, they had laws laying out what was acceptable and non-acceptable conduct. Edin the steppe brings us to Enkidu (Adam), Shamhat (Eve), naked man, later a clothed man, animal companions who are herbivores, knowledge of good and evil. Edin the steppe brings us to Eridu and Ea, and his boast: I gave man wisdom but not immortality", anticipating God's actions in Eden. The motifs associated with Sumer's edin reappear in Genesis' Eden.
https://bibleinterp.arizona.edu/articles/2015/04/day398028
the Sumerian Edin did possess trees because of rivers, lakes, and man-made irrigation canals and water-retention ponds for irrigation. Wikipedia on Steppe:"...characterized by grassland plains without trees apart from those near rivers and lakes..." Innana the goddess of Uruk finds an uprooted tree near Uruk, she has it planted in her garden intending to make furniture of it after maturity. A snake that "cannot be charmed" makes a nest at its base preventing its being cut down. Hero Gilgamesh learns of her sorrow and takes an axe, kills the serpent, chops down the tree and makes a throne of it for her.
I understand that there were two Sumerian edins. The oldest was southern Mesopotamia and Sumer. By 3000 BC Sumerian colonies had been established in upper Mesopotamia, and I would assume they called this steppe land edin as well. In the northern area the Euphratyes is mostly one stream, but south of ancient Sippar it subdivides into four streams which subdivide into numerous branches which are tapped as irrigation canals. So an upper Mesopotamian river of edin (principaly today's Syria) becomes four streams south of today's Anah (south of ancient Mari) to become four streams of Genesis. Eden's stream flows downwards from the higher edin steppe land northwest of Mari, to become the four rivers of Genesis eden.
So, Sumer's edin has led us to Eden's pre-biblical origin, Eridu and its god Enki/Ea who boasted of allowing Adapa (symbolizing mankind) to obtain wisdom like a god, but not immortality, a motif picked up later in Genesis.
Eve and the serpent represent the religious culture of earth and vegetation because goddesses and animals (especially the goddess of fertility, who is always represented naked holding a serpent) were worshipped by Canaanite and foreign people; Adam heeds these two images that are in opposition to the pastoral religious system; because of this, Adam is condemned as Cain was. On the other hand, more than elsewhere, Noah is seen as a new Adam who inaugurates a world reborn from the Flood. However, contrary to Adam, Noah can eat meat, being, therefore, a part of the cattle culture (Gen. 9:3). Without a doubt, Noah represents the replacement (by means of the figure of the Flood) of an old agricultural order by a new pastoral one.
Again, in a BBC TV programme broadcast in 2011 (episode 3 of The Bible’s Buried Secrets), Francesca Stavrakopoulou claimed that the serpent symbolized snake worship; she seems to be thinking of the bronze serpent Nehushtan.
J. Coppens and J.A. Soggin[6] saw the serpent as symbolic of the Canaanite fertility cult. It is true that there is evidence suggesting that the serpent could symbolize fertility in Canaanite religion...
K.R. Joines, “The Bronze Serpent in the Israelite Cult”, Journal of Biblical Literature 87 (1965), 245-58, at 246-50; idem, Serpent Symbolism in the Old Testament (Haddonfield, NJ: Haddonfield House, 1974), 63-73. She points, for example, to the frequent association of the serpent in Canaanite iconography with the nude goddess Qudshu, in addition to bulls and water, all of which were symbolic of fertility or life.
A later depiction of the nephesh is two snakes on a pole;
None of the characters in the Adapa myth was called a snake or serpent. Another myth did mention a serpent eating a plant denying man (Gilgamesh) a chance at rejuvenation of life so many scholars seized on this snake being behind Eden's serpent, and for over 100 years this is the most popular proposal amongst scholars. The problem? The Gilgamesh snake doesn't speak and doesn't walk. Agreeing with scholars about the Adapa myth being the closest parallel to mans acquiring knowledge but not immortality, I asked myself a question: Given that no snake appears in the Adapa myth, had anyone in Academia sought serpent associations in other myths for any of the characters? The answer appeared to be no. So I investigated various myths looking for any mention of Anu, Ea, Dumuzi, and Gishzida which might reveal a serpent association. I was successful. In other myths Ea, Dumuzi, and Gishzida all bore the Sumerian epithet ushumgal, ushum= serpent, gal= great, or "great serpent."
Ningishzida (a variant of Gishzida) is represented by a basmu: "The symbol and beast of Ningishzida was the horned snake or dragon basmu (see snakes)...p. 140. Jeremy Black and Anthony Green. Gods, Demons and Symbols of Ancient Mesopotamia. An Illustrated Dictionary. 1992.
Gishzida (Ningishzida) offered Adapa bread that he thought had been forbidden him by Ea, as it the bread of deathThus naked Enkidu's (EDIN) became
a "delightful" place for him and his herbivore companions (wild cattle and antelope) to live in? The myths declare edin is a dangerous place, lions, leopards and snakes inhabit it. I was informed by Professor George that (EDIN) means "back" (as in a person's back)and that by anology the steppe lands surrounding and "backing" the Sumerian cities' walls, came to be associated with the steppe where shepherds grazed their sheep and cattle. Every Sumerian city had a god or goddess who's fields were worked by men on the gods' behalf. Some art forms show food from these gardens, surrounded by edin the steppe, being presented to the god/goddess by naked men, whom I presume to be naked gardeners, for the gods made man to work their city-gardens in edin to provide food for the gods, freeing them of the back-breaking gardening chores: weeding, clearing canals of silt, etc. Ergo, Enkidu's (EDIN) is not the only prototype.
Moses used the term "serpent" much like we use the phrase "snake in the grass" as a derogatory term describing who it was that confronted eve.

