If the moral principles that govern our behavior are rooted in habit, custom, feeling and fashion, then the rapist that goes against the herd morality is doing nothing more serious than acting unfashionably.
Now my post isnt towards those that agree with my post rather the atheists that believe in an objective morality.
To me it seems your question is "If atheists reject the notion of absolute morality, how can they say anything moral/immoral?". Is that correct?