Here is a wonderful list of computer games for Christians. Hmm, I don't see Halo, Gears of War or Command & Conquer.
100 Computer Games Especially for Christians
Whether you’re a parent of an impressionable child or an adult who’s fed up with lewd and violent themes in video games, there is hope for moral gamers. These 100 computer games promote Christian values, focus on Bible lessons and Scripture, and avoid the scandalous environments of mainstream games, without giving up on fun.