That's easy. Pornography is dangerously addictive; Mel Gibson's movie is a one-time watch.
Is it not an accounting faux pas to compare the income from one movie against the gross take of an entire industry?
Exactly, the appropriate comparison would be the entire religious themed industry, everything from music to books and movies. Heck, you could argue all the money donated to churches to keep them running is part of the "religious industry".
Good morning ...yes, as post 7 says, the source is comparing one apple with the entire citrus-fruit industry, including that bizarre-tasting " 'orange' juice" that's really cheap at the Bi-Lo. Not exactly an honest procedure.
You're also right that pornography is habit-forming, because it produces epinephrine in men's brains and gives them a physical charge. (A medically-educated FReeper gave us a lecture on the scientific meaning of "addiction" recently, so I hesitate to use that word :-). On the other hand, viewing action films can produce adrenaline, another chemical "high," so maybe it's a wash vis-a-vis "The Passion." My mom said that was an action film.