Houston, Texas (CNN) -- Joel Osteen strides into the former Compaq Center. Some 20,000 people are standing and singing. Purple lights softly pulse across the ceiling, and mist floats around two giant screens flashing words to the songs. It's not a pulpit but a podium. It's not an altar but a stage. There is no cross. Instead a huge globe spins, and two massive bubbling creeks flank the stage. A lighting system softens distant corners of the massive arena and spreads colored light and smoke in strategic spots. Somehow, the space that will hold 40,000-plus on Sunday morning doesn't feel...