There is a web site called Scripture Voice that has some very interesting points of view. I just read something that I have never thought about before. The title to this article is Cain Married His Sister. Stop and think about it. Where did the people come from back then? God created Adam and Eve and they were the first human beings. Then people were perfect and there were no sinners. Then sin came and God had to change things. This has made me want to do some research on this. But this website has some other really great articles to read.