The Fall of Man | What Really Happened in the Garden of Eden?

1.) The localization of Eden:

While the 2 rivers Tigris and Euphrates are easy to identify today, we can only speculate about the localization of the other two rivers. I refer to the Eden hypothesis of the Egyptologist David Rohl: 

https://en.wikipedia.org/wiki/New_Chronology_(Rohl)#Garden_of_Eden 

The King James Version unfortunately translates "land of Cush" in Genesis 2:13 as "land of Ethiopia," which is much too far from the Euphrates and Tigris rivers. 

Cush was a son of Ham and lived first in Mesopotamia. 

Thus, Cush's son Nimrod built the city of Babel (Babylon) in Mesopotamia. 

Later Cush sailed to North Africa and populated the land we know today as Ethiopia. 

So when Moses wrote down the book of Genesis (~1450 BC) there was another "land of Cush" in Mesopotamia. 

2.) In Matthew 23 Christ blames collectively the serpent race for the murder of Abel:

Matthew 23:33-36 CNT 

"Serpents! Race of vipers! How could you escape from the judgment of Gehenna? For this reason, behold! I send to you prophets and wise men and scribes. Some of them you shall kill and crucify, and some of them you shall flog in your assembly halls and persecute from city to city! Thusly should come upon you all the righteous blood poured out upon the earth, from the blood of the righteous Abel unto the blood of Zacharios who had been murdered between the temple and the altar. Truly I say to you, all these things shall come upon this race! " Thus Christ confirms the connection from Cain's descendants (Kenites) over the Canaanites to the Edomites in his time in Judea.

3.) Cain's descendants (the Kenites) were as intrinsically evil as he was: 

Flavius Josephus - Antiquities of the Judeans Book 1.2.2 

"And when Cain had traveled over many countries, he, with his wife, built a city, named Nod, which is a place so called, and there he settled his abode; where also he had children. However, he did not accept of his punishment in order to amendment, but to increase his wickedness; for he only aimed to procure every thing that was for his own bodily pleasure, though it obliged him to be injurious to his neighbors. He augmented his household substance with much wealth, by rapine and violence; he excited his acquaintance to procure pleasures and spoils by robbery, and became a great leader of men into wicked courses. He also introduced a change in that way of simplicity wherein men lived before; and was the author of measures and weights. And whereas they lived innocently and generously while they knew nothing of such arts, he changed the world into cunning craftiness. He first of all set boundaries about lands: he built a city, and fortified it with walls, and he compelled his family to come together to it; and called that city Enoch, after the name of his eldest son Enoch. 

... 

Nay, even while Adam was alive, it came to pass that the posterity of Cain became exceeding wicked, every one successively dying, one after another, more wicked than the former. They were intolerable in war, and vehement in robberies; and if any one were slow to murder people, yet was he bold in his profligate behavior, in acting unjustly, and doing injuries for gain." 

"Ye shall know them by their fruits" (Matthew 7:16 KJV) 

And their fruits are just as evil today as they were 7000 years ago, because it is in their nature. 

• "a corrupt tree bringeth forth evil fruit" (Matthew 7:17 KJV)
• "Ye are of your father the devil, and the lusts of your father ye will do." (John 8:44 KJV) 

4.) The first Christians in the first centuries after Christ still knew the true origin of Cain:

The following pseudepigrapha text passages are from the early centuries after Christ and were NOT written by the apostles. The writings do NOT belong in the biblical canon, but it shows us how the first Christians in the early centuries thought about Cain and the serpent.

Protoevangelium of James 13:1-5

"In the sixth month of her pregnancy, Joseph came from his house-building and went into the house to find her swelling. And he struck his face and threw himself on the ground in sackcloth and wept bitterly, "How can I look to the Lord God? What will I pray about her, for I took her as a virgin from the temple of the Lord and did not guard her? Who has set this trap for me? Who did this evil in my house? Who stole the virgin from me and defiled her. Has not the story of Adam been repeated with me? For while Adam was glorifying God, the serpent came and found Eve alone and deceived her and defiled her - so it has also happened to me."

Gospel of Philip 61:5-10

"First adultery came into being, afterward murder. And he (Cain) was begotten in adultery, for he was the child of the serpent. So he became a murderer, just like his father, and he killed his brother. Indeed, every act of sexual intercourse which has occurred between those who are unlike one another is an act of adultery."