Quote:"Who did Cain marry, and did he not commit incest, and was other individuals alive that were not initial reported?"
Skeptics have used Cain's wife time and again to try to discredit the book of Genesis as a true historical record. Many of them have also claimed that, for Cain to find a wife, there must have been other "races" of people on the earth who were not descendants of Adam and Eve.
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Therefore, even as through one man sin entered into the world, and death by sin, and so death passed on all men inasmuch as all sinned" (Rom. 5:12)
We read in 1 Corinthians 15:45 that Adam was "the first man." God did not start by making a whole group of men.
The Bible makes it clear that
only the descendants of Adam can be saved. Romans 5 teaches that we sin because Adam sinned. The death penalty, which Adam received as judgement for his sin of rebellion, also passed on to all his descendants.
Since Adam was the head of the human race when he "fell," we who were in the loins of Adam "fell" also. Thus, we are all separated from God. The final consequence of sin would be separation from God in our sinful state forever. Of course this is where salavation through Jesus comes in, and all that good jazz.
There was only
one man at the beginning-- made from the dust of the earth (Gen. 2:7). This means that Cain's wife was a descendant of Adam. She could not have come from another "race" of people and must be one of Adam's descendants.
Cain was the first child of Adam and Eve recorded in Scripture (Gen. 4:1). He and his brothers, Abel (Gen. 4:2) and Seth (Gen. 4:25) were part of the
first generation of children ever born on this earth. Even though only these three males are mentioned by name, Adam and Eve had other children. In Genesis 5:4 a statement sums up the life of Adam and Eve-- "
And the days of Adam after he had fathered Seth were eight hundred years. And he fathered sons and daughters." This does not say
when they were born. Many could have been born in the 130 years (Gen. 5:3) before Seth was born.
During their lives, Adam and Eve had a number of male and female children. The Jewish historian Josephus wrote that "The number of Adam's children, as says the old tradition, was thirty-three sons and twenty-three daughters." The Bible does not tell us how many children were born to Adam and Eve. However, considering their long life spans (Adam lived for 930 years-- Gen. 5:5), it would seem reasonable to suggest there were many. Remember that they were commanded to "
Be fruitful, and multiply" in Genesis 1:28.
If we now work totally from Scripture, without any personal prejudices or other extra-biblical ideas, then back at the beginning, when there was only the first generation, brothers would have had to have married sisters or there would have been no more generations. We are not told when Cain married or any of the details of other marriages and children, but we can say for certain that some brothers had to marry their sisters at the beginning of human history.
Many people immediately reject the conclusion that Adam and Eve's sons and daughters married each other by appealing to the law against brother-sister intermarriage. Some say that you cannot marry your relation. Actually, if you don't marry your relation, you don't marry a human.

A wife is related to her husband even before they marry because
all people are descendants of Adam and Eve-- all are of "one blood." The law forbidding marriage between close relatives was not given until the time of Moses (Lev. 18-20). Provided marriage was one man to one woman for life (based on Gen. 1 and 2), there was no disobedience to God's law originally when close relatives (even brothers and sisters) married each other.
Remember that Abraham married his half-sister (Gen. 20:12). God blessed this union to produce the Hebrew people through Isaac and Jacob. Like I said, it was not until some 400 years later that God gave Moses laws that forbade such marriage.
Today brothers and sisters (and half-brothers and half-sisters, etc.) are not permitted by law to marry because their children have an unacceptably high risk of being deformed. The more closely the parents are related, the more likely it is that any offspring will be deformed.
There is a very sound genetic reason for such laws that is easy to understand. Every person has two sets of genes, there being some 130,000 pairs that specify how a person is put together and functions. Each person inherits one gene of each pair from each parent. Unfortunately, genes today contain many mistakes (because of sin and the Curse), and these mistakes show up in a variety of ways. For instance, some people let their hair grow over their ears to hide the fact that one ear is lower than the other-- or perhaps someone's nose is not quite in the middle of his or her face, or someone's jaw is a little out of shape-- and so on. Let's face it, the main reason we call each other normal is because of our common agreement to do so.
The more distantly related parents are, the more likely it is that they will each have
different mistakes in their genes. Children, inheriting one set of genes from each parent, are likely to end up with pairs of genes containing a maximum of one bad gene in each pair. The good gene in a pair tends to override the bad so that a deformity (a serious one, anyway) does not occur. Instead of having totally deformed ears, for instance, a person may only have crooked ones. (Overall, though, the human race is slowly degenerating as mistakes accumulate over generation after generation.)
However, the more closely related two people are, the more likely it is that they will have similar mistakes in their genes, since these have been inherited by the same parents. Therefore, a brother and a sister are likely to have similar mistakes in their genes. A child of a union between such siblings could inherit the same bad gene on the same gene pair from both, resulting in two bad copies of the gene and serious defects.
However, Adam and Eve did not have accumulated genetic mistakes. When the first two people were created, they were physically perfect. Everything God made was "
very good" (Gen. 1:31), so their genes were perfect-- no mistakes. But, when sin entered the world (because of Adam-- Gen. 3:6, Rom. 5:12), God cursed the world so that the perfect creation then began to degenerate (that is, suffer death and decay-- Rom. 8:22). Over thousands of years, this degeneration has produced all sorts of genetic mistakes in living things.
Cain was in the first generation of children ever born. He (as well as his brothers and sisters) would have received virtually no imperfect genes from Adam and Eve, since the effects of sin and the Curse would have been minimal to start with (it takes time for these copying errors to accumulate). In that situation, brother and sister could have married with God's approval, without any potential to produce deforming offspring.
By the time of Moses (a few thousand years later), degenerative mistakes would have built up in the human race to such an extent that it was necessary for God to forbid brother-sister (and close-relative) marriage (Lev. 18-20). By this time, though, there were plenty of people on the earth, and there was no reason for close relations to marry.
Quote:Remember when Cain was cast out of Eden God placed a mark on him so he would be distinguished and not killed by others. Which others? The population should have been 5 - Adam, Eve, Abel (now dead), Cain and Seth.
First of all, in the days before civil government was instituted to punish murderers (Gen. 9:6), someone would want to harm Cain for killing Abel if they were closely related to Abel! Strangers could hardly have cared. So the people Cain was afraid of could not have been another race of people.
Secondly, Cain and Abel were born quite some time before Abel's death. Genesis 4:3 states: "
And in the course of time it came to pass that Cain brought of the fruit of the ground an offering unto the Lord."
Note the phrase "
in the course of time". We know Seth was born when Adam was 130 years old (Gen. 5:3), and Eve saw him as a "replacement" for Abel (Gen. 4:25). Therefore, the period from Cain's birth to Abel's death may have been 100 years or more-- allowing plenty of time for other children of Adam and Eve to marry and have children and grandchildren. By the time Abel was killed, there could well have been a considerable number of descendants of Adam and Eve, involving several generations.