Accepting that calling something "illogical" is tantamount to demonizing it is accepting the rationalist's rule set for assessing the quality of a worldview. Take the teeth out of the insult and it can't bite.

From a rationalist's point of view, though, that's changing it from a dismissal of the religious belief to a dismissal of the person with the religious belief. It's much easier to accept that someone is wrong (or that you might be wrong yourself) than that someone is uninterested in what's right.