I think
Godspell is too "out there" to work for film. I own the movie and enjoy some of the performances but I'd compare it best to
Hair: you have to experience it live, it's a theatrical event. In the original production, the cast hung out with the audience during intermission. You need an intermission between the acts in order to transition to the Passion and Resurrection. It's one of my favorite shows (first musical I ever saw at six years old when my church did it) but it's too avant-garde to be taken seriously, for lack of a better explanation.
P.S. - www.godspellpage.com is a great source for the show.
There's photos of the the Toronto cast (Garber, Radner, Levy, Short) and original off-Broadway production.
"Everybody has a different idea of love. One girl I know said, 'I knew he loved me when he didn't come in my mouth.'" ~ Andy Warhol