humans have, since recorded time, always tried to make their god fit their image, and also the icons that related to their god. Adam and Eve are huge icons in the biblical pantheon, and thus subject to culturally influenced representations. Most people just figured that they would have belly buttons, so that they would look like us, is my guess. My theory is that because they are the first humans, and the genetic template for us all, they would have the belly buttons so that everyone else would have the genetic "switch" to turn on and give us belly buttons. But there is no biblical proof for that, either.
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"My give up, my give up." - Jar Jar Binks
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