Dr. Lindstrom,in Genesis Chapter 4 verse 17,do we know who Cains’wife was and where she came from?
Cain’s wife was one of his sisters. Incest was not forbidden until 1500 years after Adam. Adam and Eve were the most perfect humans that ever lived and there was no problem with birth defects. Today you don’t even have to marry a relative to have the risk of birth defects as the human race is on a downhill slide as a result of sin.