The missing navels

Imagine that a scientist invents a time machine, travels back in time, and meets Adam and Eve just a few days after they are created.  If he knew nothing of the Bible’s account of their origin he would assume they had been conceived, born, and grown to maturity just as other people have.  If he tried to estimate their ages from their appearance he would conclude they were much older than they really were.

But suppose he noticed that they had no navels.  Would he come to the correct conclusion that they had been specially created by God or would he stick to his belief that they had been born just as other humans are and try to find some other explanation for their lack of navels?