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According to Genesis 5:

3 When Adam had lived 130 years, he had a son in his own likeness, in his own image; and he named him Seth. 4 After Seth was born, Adam lived 800 years and had other sons and daughters. 5 Altogether, Adam lived a total of 930 years, and then he died.

6 When Seth had lived 105 years, he became the father[b] of Enosh. 7 After he became the father of Enosh, Seth lived 807 years and had other sons and daughters. 8 Altogether, Seth lived a total of 912 years, and then he died.

If we continue reading, we see that we are descendants of Seth as his genealogy leads to the birth of Noah. God destroyed other families and spared only the house of Noah (8 people), from whom the earth was repopulated.

Adam->Seth-> ... ->Methuselah->Lamech->Noah->(Noah's Sons)-> .... ->Us

Genesis 7:23- Every living thing on the face of the earth was wiped out; people and animals and the creatures that move along the ground and the birds were wiped from the earth. Only Noah was left, and those with him in the ark

Cain's descendants and Seth's siblings' descendants were therefore wiped out.

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You're assuming, it seems, that Seth's descendants were inbred. Or that only the male line counts. (Well, that's an assumption you'd share with the authors of the Bible, so fair enough, I suppose.) Or something. –  TRiG Aug 28 '13 at 11:19
As @TRiG says, one of Cain's descendants could still have been an ancestor of Noah. Cain's great^10 granddaughter could have been Noah's mum. –  Wikis Aug 28 '13 at 11:56
It is also possible that one of the four wives on the ark was a descendant of Cain in some way. –  Narnian Aug 28 '13 at 14:42

3 Answers 3

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Your answer seems correct. As God has never approved of being unequally yoked. Cain's descendants followed after Cain and dwelt in his city (Gen 4:17). God never wanted people to live clustered in cities, where sin would abound, and there are various examples of this throughout Genesis. God's people stayed in the wilderness, tilling the ground and doing the work God had commanded to them as a blessing, even though the ground was now cursed. These were the people that began "calling on the name of the LORD." (Gen 4:25)

You could see the striking difference between the people that followed God and obeyed His commandments and those that did not.

From this point you can infer that Noah and his sons, being righteous in the eyes of God, would not mix with those who did evil in the eyes of God. If this is so, then Noah and his 3 sons would have wives that loved the LORD and were not of the lineage of Cain.

Of course it could also be that one or more of the wives were descendants of Cain that decided to follow in the way of the LORD. Nevertheless, the Bible offers no such insight on this matter. So the true answer is we do not know, but I'm definitely more inclined to say that they all were destroyed.

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Whether or not Cain has any DNA remaining in any or all of the humans now existant on earth, it can be unequivocally stated that Cain has no "descendants." A descendant - at least in a legal sense - implies legitimacy to which the Bible itself does not lend credence.

Abraham, for example, is technically the ancestor of Ishmael, but after he was kicked out, was not reckoned as a descendant.

Noah is reckoned as a descendant of Seth, regardless of whether or not a daughter in the line of Cain was a grandmother of some relation. Cain's line was wiped out with the flood, as were the Nephilim.

Cain's legacy was to be "a restless wanderer on the earth." This would imply that any progeny would not necessarily have his legacy, and hence while he may be an ancestor, his children are not "descedants."

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The Bible is silent on this matter. The Bible doesn't mention explicitly that only the descendants of Cain are destroyed in the flood. Therefore, we can only speculate.

There are other less authentic books apart from the books of the Bible. These books sometimes help us to understand the accounts written in Genesis better and in more detail. According to Conflict of Adam and Eve with Satan and other books like Life of Adam and Eve, the descendants of Cain lived completely isolated from the descendants of Seth. It was the descendants of Cain who were wicked and God wiped them from the earth by flood, saving only the descendants of Seth, who were only eight people when the flood happened. The descendants of Cain were numerous because unlike the descendants of Seth, they were very active sexually and reproduced rapidly, resulting in large population.

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those apocryphal texts are surely interesting reading ... but the conclusion that only a few Sethian descendants existed because "unlike the descendants of Seth, they were very active sexually and reproduced rapidly" seems tenuous –  warren Dec 17 '13 at 14:28

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