I wish I could agree with you. The only thing is, I've seen and heard lots of Catholics reading this book. They enjoyed it. Some of the dumber ones were even intrigued by it - "it makes ya think, ya know?" While the vast majority of Mass attending Catholics I know said it was a work of enjoyable fiction. Unfortunately, not everyone is tuned into the attacks on our Church.
I don't think Catholics will stay away in droves. In fact, in places like Philly, where the majority religion is Catholicism, I'm afraid the majority of the moviegoers will be Catholic.
Sadly, I've heard similar endorsements from a couple of Italian cradle Catholics I know. Maybe I just prefer not to imagine the wafer-thin catechization so many Catholics receive. One actually said to me "why couldn't Jesus' decendents be here among us? Nobody reeeeally knows!" The irony of ironies is that the real truth of the Church, it's power, history, influence and drama is forsaken for such lame counterfeit conspiracy theories that are simple amusements but which change nothing in our lives.