Adam and Eve are archetypes, not intended to be taken as actual individual humans.
But if they were, consider this: If God created them perfectly (how else could He?) then they must have had belly buttons. But as they didn't have parents, they couldn't have had belly buttons.
Now, if God created the universe, then everything is a clue to His nature, all we have to do is look around us. No reason to stay locked into a musty old book when a far grander example of His handiwork surrounds us. If we read the book correctly, I guess it shouldn't conflict with the natural world we live in; however when it does conflict God's obvious intent is for us to doubt our interpretation of the book, and go with what our senses tell us.