Should we be afraid of the truth?
There is such a thing as age appropriateness, and I don't think this is it. Do you see some great purpose served by exposing an 8 yr old to 90 minutes of torture? There will be grown men sickened and weeping from this film. Do you think a child that age will be somehow more "Christian" for possibly having the wits scared out of him? This film isn't going anywhere; it'll be there for the kid to see in five or six years when he is more able to digest and understand what he's seeing.