I know Esham was ATHEIST, not quite sure if he still is...I've heard some rumors.
"I dont believe in god, so its odd, everytime I bust ill shit niggaz scream oh my god" -Esham
"I dont believe in shit I cant see, so dont ask me about G-O-D cuz my religion is reality." -Esham
Plus Mastamind/TNT from Natas are most likely atheist.
I cant remember which guy, but one of the Dead Prez members is Atheist or possibly both of them.
Brotha lynch used to say he was atheist, not sure if he still is considering he doesnt rap about that shit anymore.
That dude from ONYX, whats his name, sticky fingerz or some shit is atheist.
I cant think of anyother at the moment. ATheism in rap is definately a rarety.