There are behavioral traits we can observe in ourselves that are useful in understanding things about us. One trait is the need to know where we came from.
The small child asks, “Mommy, where did I come from?” The need stays with us.
Evidence of this is the gazillions spent every year on archeology. The money for these digs does not help us produce food, health or housing. If all the digs stopped tomorrow, little would change. But, they will not stop because of our, perhaps irrational, desire to know where we came from.
Sitting around camp fires or huddled in caves, the first humans must have asked the same question. The shamans gave answers, “The god made us, the crow dropped us here…” We don’t know all the stories that were told.
At a certain point in the campfire stories, a historical accident happened. They were written down. There was crude ink and paper and enough prosperity so a few people had time to write down the myths.
The written stories were no more sophisticated than the ones of the previous thousands of years, they just happened to be there at the point in time when they could be preserved. That’s were the Bible, Adam and Eve, Moses and the life of Jesus came from.
What the Bible stories mean has changed with the culture. But, the need for someone to tell us a myth about where we came from has not.