Because somehow, since religion is belief-based it's becoming more and more difficult every single day to keep people believing in these localized fairy tales when we are all able to compare notes by using uncensored, real-time communication networks. And the more this happens, the more upset and frustrated those who are trying to remain in control are getting; and in their desperation the less of a sense of humor they can afford to have as the very survival of their belief-based system is at stake.
While I am not necessarily condoning any approach, it's fairly obvious that Anonymous (the loose group claiming this name) and 4chan have the right idea. In order to get one's message across in this day and age, more than ever privacy and anonymity are going to be very important liberties; certainly worth making sure they remain something we have access to.
Thanks in no small part to people such as Lenny Bruce, who had the courage to stand up for those rights when they knew all too well that it would destroy their careers when no such options existed.