Although "Through the Looking Glass" is impressive, it never really got me all that excited. "Church of the Machine" however, has just some of the most awesome music and lyrical parts found in any SyX song! The keyboard with the rising guitars at the beginning, then the haevy guitar part with the (sounds like) chanting in unison with the china crash cymbal is amazing. And the pre-chorus, "Scream and noone hears my plea; Faceless masses falling to their knees" is awesome, especially with that little guitar run up just before the chorus.
I love this song! My definite pick for best on this album.