If you look at the universe logically, any god that created it did so with rules and laws in mind. Things are created in that way for a reason. A god that would just change things willy nilly would have included magic etc where the laws could be circumvented etc.
This would logically lead one to believe that any god would then use the laws of science to create any creatures, not just do it from scratch. Therefore, humans, and "adam and eve" were more then likely created through natural means.
Quite likely this means that god may have created humans by using animals and imbuing said humans with a "soul". Most likely animal to be used, would be a ape of some kind (Damn dirty apes!!).
Therefore, i suggest that adam and eve were still born naturally, from monkeys, they were just the first homo-sapiens, or humans.
This means they would have actually had belly buttons as well.
In addition, it's quite likely that the apes they are descended from were vegetarians, eating only fruits and nuts. The "Apple" was actually meat.......which led to corruption by causing "humans" to want to hunt, develop weapons etc.
I don't personally believe any of that, but it at least makes some kind of logical sense.