You make a good point, but no Christian with a brain (and Colson has a very good one) is miffed that Gibson got snubbed, it's as natural as rain falling from the sky.
Although the movie couldn't be nominated because of submission rules (it is a foreign language film, but had no foreign country of origin to submit it), they could have, and should have, nominated Gibson for his extraordinary accomplishment. Johnny Depp gets a nomination and not Jim Caviezal? And Caleb Deschanel certainly deserved an Oscar for his cinematography...he's no hack, having won for "The Black Stallion".
I will wager that the same people who gave Densel Washington a Best Actor Oscar for the most offensive, bigoted portrayal of a corrupt black L.A., cop ("Training Day") never even watched the DVD of Passion that everyone was sent.