The members of the band Petra say rock 'n' roll music is the best way to get kids to think about God. "For such a long time," says singer John Schlitt, "the church . . . saw rock 'n' roll as a terrible, demonic style of music. And we really didn't believe that. We believed it was a music style that kids our age could relate to. And that's the people that we were trying to reach." The group D.