PORTLAND, Ore. -- In the world of Christian video games, players sport the armor of God, the best weapon is a ball of holy energy known as a ''smite,'' and demon-possessed Roman soldiers drop to their knees in prayer when they're hit. Right now, the religious-themed games represent just the tiniest fraction of an $11-billion industry, but developers expect the market to grow with the popularity of faith-based movies and books such as Mel Gibson's ''The Passion of the Christ'' and the ''Left Behind'' series of novels. Just how to make the jump to the mainstream, finding producers for Christian...