Just so I can get a more sympathetic word in here. We don't allow these kinds of discussions pretty much because in an open forum like this, it just becomes a huge magnet for lunatics. As a fellow believer, I understand what you're saying, but I don't think a general game site on the Internet is the place to discuss it. If you're on a Christian forum, or if you're talking to someone one-on-one in chat, it tends to turn out well, but in this kind of open environment where a lot of people don't even understand your perspective, you'll have all kinds of stuff thrown at you before you even know what hit you.
There is a group that is working on "Christian" videogames, although I haven't seen much of their work. What I have seen still seems to rely too much on blatant allegory for my tastes (sword of the spirit, demon hunting, etc.), which probably makes it a poor tool for evangelism as well. If you want to discuss more on my philosophies behind it all, feel free to shoot me an e-mail.