Eight: Journey
Beautiful and moving, Journey deals with ambiguity and metaphor successfully in a way that most games don't even bother beginning to try. What's more, it uses those metaphors in a way that gives the player the biggest, most positive screen upon with to project their ideas of religion and faith. In addition to that, the game is marvelously designed for pleasant cooperative experiences. It's also a perfect game to simply introduce the power of the medium to skeptics.