Alright theres a bunch of religious music out there, and I'm so used to rap being about clubs, chicks, and money, and the serious stuff is usualy about politics (Fort Minor, Immortal Technique) well this is serious stuff and its about atheism, he doesn't just mention it once or twice in a song, almost all his songs are about it, he's an ex iraq soldier, and his name is Greydon Square.

Some of his songs:

http://www.youtube.com/watch?v=gpZ5xfuxTig (Say, probably my favorite song by him so far)

http://www.youtube.com/watch?v=d5R8kok_4d4 (a rational response, a song thats heavily composed of atheist arguments, and such in musical form)

http://www.youtube.com/watch?v=9spM5t490No (molotov, a song that starts out more political like, but goes on to talk about religion)

He's alright, I've been looking for some good music about atheism, anybody else now of any, can be any kind of music.