That means God was OK with incest OR the creation story is about the birth of man. In Hebrew, 'Adam' isn’t just a name—it literally means 'man'. So again, the creation story can either be about one man called Adam and his wife Eve, or about the birth of man. Since Genesis 5:1-2 explicitly refers to Adam as 'them', it makes sense to think of Biblical Adam as an example of one man that is substituted for a whole (the entire human race). My take is God didn’t intend for Genesis to be read literally.