The law regarding those prohibitions didn't happen until long after both Adam & Eve and after Noah repopulated the earth. Based on today's customs the idea of Adam producing children with his daughters and his sons with their sisters seems disgusting, but remember that these were pure blood lines and the problems of "inbreeding" like you get when you breed animals too closely probably didn't exist because of them being pure blood lines. I believe that when God made the law concerning who was allowed to procreate with whom it was because at that point our blood lines were no longer pure and any further "inbreeding" would have been harmful to the human race.
I am no scholar. I have not studied it. I just know that God had a reason for making every law and he had perfect timing. I think that what this line of questioning does is try get an explanation from God about something that may have no explanation.
I found this online regarding the questions of where Cain's wife came from.
"When sin entered the world at the Fall, bringing with it death, disease, and destruction, the gene pool would gradually become corrupted. At first, no harm would result from marriage of brothers and sisters, and had sin not entered the world, presumably no harm would have ever entered.
As the generations passed, however, disease, environment, and sin took their toll on the genetic pool, which resulted in mutant and defective genes. Incest was prohibited in Moses' time, from a biological standpoint, because it now was dangerous and resulted in deformed, moronic, or otherwise defective offspring.
Moreover, in addition to the biological problem which arises from incest, there is also an ethical one. God forbids incest on moral grounds, and this is more crucial than the biological aspect (Leviticus 20:11).
Incest disrupts the family social and moral structure. The family is the only God-ordained institution in the world other than the church. At the initial formation of the family structure in Cain's day, it is difficult to presume what happened with inter-marriage. Thus we cannot be sure to what extent incest occurred. One things is certain: after God's ordained family structure stabilized, incest was sin."
From the book "Answers to Tough Questions," by Josh McDowell and Don Stewart
I need to go now but want to look further. Right now the needs of my 3 yr old gson outweigh the need to write on this subject.
I am no scholar. I have not studied it. I just know that God had a reason for making every law and he had perfect timing. I think that what this line of questioning does is try get an explanation from God about something that may have no explanation.
I found this online regarding the questions of where Cain's wife came from.
"When sin entered the world at the Fall, bringing with it death, disease, and destruction, the gene pool would gradually become corrupted. At first, no harm would result from marriage of brothers and sisters, and had sin not entered the world, presumably no harm would have ever entered.
As the generations passed, however, disease, environment, and sin took their toll on the genetic pool, which resulted in mutant and defective genes. Incest was prohibited in Moses' time, from a biological standpoint, because it now was dangerous and resulted in deformed, moronic, or otherwise defective offspring.
Moreover, in addition to the biological problem which arises from incest, there is also an ethical one. God forbids incest on moral grounds, and this is more crucial than the biological aspect (Leviticus 20:11).
Incest disrupts the family social and moral structure. The family is the only God-ordained institution in the world other than the church. At the initial formation of the family structure in Cain's day, it is difficult to presume what happened with inter-marriage. Thus we cannot be sure to what extent incest occurred. One things is certain: after God's ordained family structure stabilized, incest was sin."
From the book "Answers to Tough Questions," by Josh McDowell and Don Stewart
I need to go now but want to look further. Right now the needs of my 3 yr old gson outweigh the need to write on this subject.