I think I heard that somewhere around 95% of the world claims to be religous..
Anyway, of course Athiests can't ask forgiveness for their sins.. but there IS no sin for them.. Sin is whatever is not of God, since an athiests god is himself, is pretty much impossible to sin.
"As long as it doesn't hurt me or anyone else, it's OK"
"As long as I think it's OK, and I get away with it, it's OK"