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?”

The house bands that play every weekend in High Desert Church — there are a dozen or so — scavenge some of their musical style from the radio and television. They reflect popular taste, though with lyrics about the power of God, not teenage turmoil.

They are not aiming for commercial success. Church-based Christian rock — often referred to as C.C.M., for contemporary Christian music — does not exist primarily to compete in mainstream culture; it exists first to bring together a community.