For that, you need some Kabbalistic background. But the bottom line is, nothing to do with flying giant red twats.
Keep in mind that God guided Moses to write Genesis perhaps a thousand years before the ancient Greeks started saying that everything was made of one or more of 4 elements (earth, air, fire, and water -- not to be confused with the band Earth Wind and Fire LOL). And of course, now we know that everything is made of elements of a large list that can fill up a periodic table. Yet our bodies are made of the same elements in the ground. And there was God telling us about this 3,500 years ago. Don't let anybody tell you that the Bible is behind times. It's always ahead of our time.