Unfortunately, this is not the first time that an activist group has decided to target Wikipedia. I'm personally aware of one group, recruited through anti-circumcision activist mailing lists, that have been systematically pushing their POV at Wiki.
Jake is correct. The anti-circumcision activists are a much smaller group, yet they managed to recruit at least 4 determined, long-time editors whose sole focus appears to be inserting their particular POV into articles of interest to them. The response from Wikipedia appears to be muted at best, though it doesn't help that one of the pro-circumcision activists (not Jake) is a particularly nasty piece of work.
Jay.