Some believe that there was a pre-Adamic race who lived on the Earth. La Peyrère is one of the proponents of this theory. He claimed that Cain’s fear of being killed by others, his marriage to an unknown woman and the fact that he founded a city (Genesis 4:14-17) were all evidences that there was another race of men that coexisted with Adam.
According to the Bible, La Peryrere theory is not valid for the following reasons:
1-The Bible states that Adam was the “first man” and the father of the first race (1 Corinthians 15:45). Adam came directly from God “the son of Enosh, the son of Seth, the son of Adam, the son of God” (Luke 3:38).
2-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).
3-Adam named his wife “Eve” “because she was the mother of all the living” the mother of the first race (Genesis 3:20).
4-The Bible indicates that there were no men upon the earth to cultivate the ground (Genesis 2:5-8).
5-Adam had Seth, after Abel’s death (Genesis 4:25; 5:3). The Bible also says that Adam had other sons and daughters (Genesis 5:3). So, Adam could have had many children that made Cain to worry about his safety.
6-Cain married a family member (Genesis 4:17). This was allowed then because the genetic pool was pure.
7-As for Cain founding a city, the average age then was around 900 years old. Cain could have produced 30 generations by the time he died. And his seed in turn multiplied. Therefore, there were enough people to occupy a city.
In His service,