You don't have to see the face of Christ to believe, but certainly it helps us emotionall;y to see a representation of it. Even Protestant homes have such depictions on the wall, although the Bible does not give us a clue about his actual appearance.
I find the Stations of the Cross a far more emotional experience than the Gibson movie. I know I am in a minority here, but I didn't feel anything spiritual in the movie. Parts of it seemed comical - eg, Christ's pratfalls.
I bought the DVD expecting a deeply spiritual experience. I was totally disappointed.