Q. The Bible only tells us that Adam and Eve had 3 sons. Where did the women come from for the sons to marry? Where in the Bible is that explained? I’m also thinking about the inbreeding that had to happen after the rain stopped and Noah and his family populated the earth. Doesn’t that mean there has to have been some physical and mental abnormalities in subsequent generations?
The first part of your question relates to the truth of the Genesis story in terms of its coherence. That is, does this all add up? Do all the details fit together? Or are there missing pieces? People interpret and understand the Genesis accounts in various ways, but the starting point for the interpretation of any story has to be to establish its coherence. There’s no point interpreting a story that doesn’t hold together.
To address this concern, let me observe that it’s actually not the case that the Bible only tells us that Adam and Eve had three sons. While the book of Genesis only narrates the birth of their three sons Cain, Abel, and Seth, a genealogy shortly afterward says, “After Seth was born, Adam lived 800 years and had other sons and daughters.” So the implication within the story is that they married their sisters.
But there’s a reason why this information is so hard to find that you didn’t realize it was there. The law of Moses forbade marrying close relatives, including sisters, and it seems that for that reason the Genesis author is providing this detail only very discreetly. This would seem to be a different challenge to the coherence of the story. But I won’t address it here, since I discuss it in another post on this blog, and you can read about it there:
The second part of your question relates to the truth of the Genesis accounts in terms of correspondence. That is, how could this have actually happened? Wouldn’t physical and mental abnormalities due to inbreeding have kept Noah’s descendants from successfully repopulating the earth? But this is to ask a modern question of an ancient text. Personally, I don’t believe that we can find the answer to a modern question in an ancient text.
Specifically, I do not believe that God’s inspiration of the biblical authors extended to supernaturally revealing to them details of things such as genetics that were not part of the knowledge of their culture. Instead, I believe that the biblical authors wrote within their own human limitations and from the observational perspective of their ancient culture. (One good example of this is when Paul tells the Corinthians that he doesn’t remember whether he baptized any people beyond the ones he names. He seems clearly to be writing within human limitations, specifically that of memory, and not getting supernatural supplements to his knowledge.)
In the book that is linked in the right sidebar, Paradigms on Pilgrimage, my co-author and I discuss much more fully the nature and implications of the observational perspective from which the biblical authors write. We also discuss at length the relationship of religion and science, suggesting that science answers questions of what and when and how, while religion answers questions of why and who. The title of one of our chapters, “Fishing in the Middle of the Lake” comes the long Algonquin name of a lake in Massachusetts, Chaubunagungamaug, which is sometimes translated, “You fish on your side, we fish on our side, nobody fish in the middle.” Apparently this is an inaccurate translation, but we suggest that it is nevertheless a good motto for science and religion to adopt. Asking modern questions of ancient texts is an exercise in “fishing in the middle of the lake,” and since, in our analogy, nobody has a boat, it’s good to be clear about what side of the lake one is standing on.
Each post in the Paradigms on Pilgrimage blog has the book’s table of contents in the right sidebar, so you can explore various parts of it as you wish. I hope it will be helpful to you.