darkman posted on Aug 13 2006 at 12:30 PM said:
If there are physical laws in our universe, we must also logically conclude that there are also moral laws.
That doesn't follow logically at all. It's like saying that there are "artistic laws" or "political laws" or "emotional laws". None of that follows from the existence of physical laws, because morality, aesthetics, politics, and emotions are not expressable in terms reduceable in a simple way to physics.
One thing that I certainly do notice is that whatever their supposed beliefs, people's behavior is at best weakly affected by those beliefs -- witness the constant questionably-justified exceptions to simple and clear laws such as "thou shalt not kill", the generally weak adherence to others like "thou shalt not commit adultery", and so on.
These mild sort of behavioral guidelines can come from codes of belief based on faith in a particular dogma, derived pseudo-logically from principles (secular humanism, e.g.), or simply adapted from the teachings of others or absorbed implicitly from observation of society (we behave in part the way people around us behave).
It seems to me that atheists just have one fewer of the many things that vaguely direct behavior, and thus their "moral" behavior as a group is not very different from that of deists. Atheists do not go around murdering, raping, pillaging, and stealing measurably more than non-atheists because the belief in god appears not to be a dominant determiner of whether people do those things.