And the washtowel claims to be xian. The last I checked, christian means believing that we are all inherent sinners through Adam, that jesus came to deal with such sin, and that we must accept that sacrifice to be "saved". It does not mean having to do additional works, such as spreading that filth from door to door. It does not mean abandoning all your celebrations--even in the bible, we are not supposed to judge others for such festivities (I will, however, judge anyone whose idea of celebration includes drink driving, since that does endanger everyone else on the roads).
Now, if they claim to be the only true xians, that binds them to what the bible says about it. I find it more offensive when one claims to abide by the bible, claims a monopoly on adherence to the bible, and then has the doctrine that, even if they can prove the Filthful and Disgraceful Slavebugger wrong using their own bible, they still have to abide by and teach the bad doctrine until the Filthful and Disgraceful Slavebugger itself alters it. Are they abiding by the bible as they gleefully claim to, or by man's doctrine despite that the bible explicitly tells us not to?
Or, they can simply abandon the whole bible and be free from it. Once they start declaring that the bible is simply a book to use black magic to enslave the whole earth, they no longer have to abide by it. Once they see jesus as nothing more than the archetype of the perfect slave or that "original sin" is another infinite-debt tool, they no longer are bound to adhere to jesus. But, until then, they are contradicting themselves by claiming to adhere to the bible and jesus and then negating both.