VICTORVILLE, Calif. — Mike Day, singer and guitarist, gathered his rock band around him. Dressed in a faded black T-shirt, jeans and skateboard sneakers, he bent his shaved head. "God," he said, "I hope these songs we sing will be much more than the music. I know it’s so difficult at times when we’re thinking about chords and lyrics and when to hit the right effect patch, but would you just help that to become second nature, so that we can truly worship you from our hearts?"