That's not going to happen and I don't think that's what they're really afraid of. They're furious at Gibson because his movie has made Christians stand up and defend their faith (they were supposed to cave-in and apologize the minute Abe Foxman called Gibson an anti-Semite). The movie might even help create more Christians by drawing people who had fallen away or who had never been Christians in the first place.
By the way, I wouldn't be surprised if some big Hollwood hot shots are also furious with Foxman for turning what might have been just a little art house film into a major cultural event.