I have recently been doing some research into the discussion of whether or not Adam (the first man) had a navel. Apparently it is been a hot topic for debate in certain Christian circles for quite some time.
I came across this article called Pre, Post, and Mid-Umbilicism: Adressing the Question of Adam's Navel. I can't tell if it's a satire or not... but it's quite amusing either way.
Philip Gosse in his book Omphalos: An Attempt to Untie the Geological Knot, suggests that a divine creator could have created Adam with a navel, just as he could have created the fossils and other geological indicators of age. He muses...
“What means this curious depression in the centre of the abdomen, and the corrugated knob which occupies the cavity?”