Discussion of morality without some sort of absolute standard, be it God or otherwise, is inherently pointless. No meaningful moral discourse can exist in a completely relativistic society, for there is no "right" or "wrong".
If you want something to consider, ponder your morals and determine whether or not they have any weight in any argument whatsoever. Ask yourself, if you have no "God" or "categorical imperative", how you can condemn Hitler or Mao without something to point to as "morally good"?
If things are simply "morally good" because we say they are, then morality is arbitrary.
*Note that I don't necessarily advocate these views, but you guys could benefit from thinking on these topics*