There are some dimensions to this issue which are being overlooked. First, parodies, even directly disrespectful ones, are much more acceptable when aimed at majorities or those securely in power. In this sense, the analogy to gay jokes and such breaks down. This acceptability stems from the veritable duty to criticize those in power for a host of reasons, which can be summarized as keeping them honest. Second, another aspect overlooked is any detail whatsoever about the guy who displayed the decal. It seems to me, as likely as not, that the person MAY be a disaffected Christian in the process of working out his demons. In this sense, I contend, aside from political speech, this type of communication is prized under our First-Amendment system. Thus, on this level, the displayer enjoys the added protection of being a seeker through relevant, expressive behavior, and not a hate-monger.