First, Adam is called the “first man” (1 Corinthians 15:45). This is inconsistent with the idea that God created men before Adam. Second, according to La Peyrère, the Gentiles were to live outside of the Garden of Eden while Adam enjoyed paradise (a privilege which came with the responsibility of obeying the Law of Paradise—not eating the forbidden fruit). Genesis 2:5-8, however, says quite plainly that before God created “the man whom He had formed,” the very same man which He placed in the garden, there were no men upon the earth to cultivate the ground. Third, God created Eve for Adam because he was alone, there was no one else like him around (“It is not good for the man to be alone… but for Adam there was not found a helper suitable for him” Genesis 2:18, 20). Fourth, Adam named his wife “Eve” “because she was the mother of all the living” (Genesis 3:20). The list goes on, but these passages should suffice to refute La Peyrère’s misinterpretation.
As for Cain’s fear of being lynched, his marriage to an unknown woman and the fact that he founded a city (Genesis 4:14-17), Adam was almost 130 years old by the time that Cain killed Abel (Adam had Seth, his next son after Abel’s death, when he was about 130 years old; Genesis 4:25; 5:3). And we know that Adam had sons and daughters (Genesis 5:3). At 130 he could have had grandkids and great-grandkids by the time that Cain killed Abel. Cain had plenty of family members to be afraid of after killing his brother.
Cain apparently married a family member (a necessity back then) at some point before Abel’s murder. It seems odd to us today, but incest wasn’t outlawed by God until the Law of Moses. It may have been around that time that generations of degenerative genetic mutations began to take a toll on our DNA. God outlawed incest for our protection. It became (and remains) dangerous for close relatives to procreate because of shared genetic defects which become expressed in their children causing severe deformities and other problems.
As for Cain founding a city, if he lived to be the average age back then, he probably lived to be about 900 years old. By the time he died, his family would have been a small city. If Cain had a child at the age of 30, and his child had a child at the age of 30 and so on, Cain could have produced 30 generations by the time he died (30 generations times 30 years each equals 900 years).
http://www.gotquestions.org/pre-Adamic-race.html
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