People mock things that they consider dangerous in the hope that what is expressed in jest can help disarm the object of the joke. The joke stated here, in my opinion, is not aimed at Christianity. It is not aimed at all fundamentalists, although it might be easy to interpret it that way. It is, again in my opinion, aimed at fundametalist thinkers who wish to use their fundamentalism as a guide to public policy.

Don't be offended by the joke unless you align yourself with the thought. It would be the same as me taking offense when the Klan is called racist; because they claim to be patriotic Americans and I claim to be a patriotic American doesn't mean we are the same.

Let's keep some perspective.