MxPx, along with P.O.D. and other artists, has a track on the soon to be released album "The Passion of the Christ: Songs" scheduled to be in stores on August 31st. This is not a movie soundtrack, but a "songs inspired by the movie" compilation.
The song is called "The Empire" and was written specifically for this album.
It was recorded in their own studio, The Clubhouse. Check out some more info here::