If he's an atheist, he isn't very good at it. And people born without limbs or who lost limbs in earthquakes or tornados or cancer might be a little surprised to know that such mishaps are only human in origin.
Yea, he's a poe. While I don't disagree that his observations about why some things in the bible are taboo (pork, for instance), and that such things became taboo for health reasons (very sensible, and probably an effective ways of keeping people from doing harm to themselves), he makes it sound like an excuse for biblical text, not an argument against anything. He's no atheist.