I am very honored to be among your first friends here on Keep The Faith! I think it would be a wonderful thing for you to start a club at your school to encourage kids to grow in their faith or even disciple them as new believers! You are right, even at a Christian school, there are still kids who don't necessarily believe in Jesus. It's just that their parents send them there.
I know God will honor your good efforts.
And as far as Carnegie Melon goes, all things are possible with God!