I don't see why you assume it is anti-Darwinists. I suspect a sizable fraction of that 16% are other anti-scientific types.

There are the "science gave us nukes and pollution" environmentalists, the medical anti-science types (vaccines -> autism, acupuncture, homeopathy, naturopathy), and some even weirder types.

I've had people express anti-scientific views to me while extolling the virtues of this product:

http://en.wikipedia.org/wiki/Laundry_ball