I believe it is stupid to read that kind of things literally. I mean, really, in what mind?
Those are all metaphors that were written by wise men, enlightened men. Each time I read Genesis I find something new.
The Gnostic interpretation of Genesis is very interesting, and it connects many dots between Genesis, and the Oriental concept of Kundalini energy:
We have sexual energy, that is the same life energy concentrated in our lower sphere, which is the sexual. Like Einstein said, matter is energy in movement. The sexual is the lower sphere, because when a man reaches a level of awareness, the sex becomes secondary, the energy starts manifesting in the form of consciousness. That is why sex is the common dot ammong religions, Buddhism call it a "Wise sexual conduct" precept, Christianity and Catholics call it "Fornication". All religions have inadequacies in this subject. All because when the sexual energy is transformed into consciousness, the
bramacharya is a posibility. Not before that.
The transformation is from the sexual sphere, our genitals, into a higher sphere, consciousness, which is born in our brains. The energy flows in a serpentine form anciently symbolized as a snake from the genitals to the brain.
So Kundalini energy is often represented in the form of a snake.
I have researched this much, in all religions we can find statements that can be explained with this context.