''Imagine this: an auditorium packed to the rafters with thousands of hand-raising energetic fans rocking out to a live band. But it's no ordinary concert: it's a weekly spiritual experience with more than 50 million people participating all over the world. That band is called Hillsong United.' -TODAYHave you ever questioned love?Have you ever questioned faith?Have you ever questioned the reason you exist?Joel Houston, the American Music and Billboard award-winning musician, songwriter, pastor'