Another Possible Effect of The Passion

If it stirs up antisemitism, more people might join anti-Zionist churches. At present, that means more people will become watered-down Episcopalians and Unitarians. I don't think that's what Mel Gibson had in mind.

UPDATE: On the other hand, if viewers look at the main villain, the high priest Caiaphas, and decide to blame priests in general, there might be a mass conversion from the Roman Catholic Church to Protestant churches. Again, I don't think that's what Mel Gibson had in mind.