Who are these other people God created whom adams sons married?
When Cain went on his way, he married others. Since Adam and Eve were the first on the earth, and at those times people lived a very long time. Eve had other children. At that time Adam and Ever were perfect really. After they became disobedient they still had traits of perfection. Why Noah and other lived a long time as recorded in the bible. Because they are still born close to perfection, he actually married other siblings or close cousins. In the bible later on it was prohibited for this activity. But due to the fact that the human race was starting out, God made it so that in-breeding would not have adverse affects like deformed children.