Morality is a system which we developed through our evolved sense of social necessities and varies from culture to culture, though the basic premise tends to be the same: That which hurts the overall society is immoral. We are social animals. Murder, rape, and so on, damage the structural foundation upon which we form social ties to our compatriots. As we grew more intellectually aware of the environment around us and of one another, so too did our morality evolve to compensate for the greater sum of knowledge into codes of law and so on.

Many animals (especially pack animals who are also social creatures) display the foundations for "morality" as well, through empathy and sympathy, which enables them to perform tasks which are utterly illogical for self-survival. For instance: A dog running into a burning building to drag its master to safety, or a wolf defending its cubs from harm instead of simply abandoning them to their fate of being devoured by whatever predator is stalking them (even if said predator is larger than the mother wolf), and so on.

It's why our morals today make the morals of centuries past look utterly barbaric and savage. We grew more aware, and thus, our morality advanced.

If anything, intellectual discourse and being willing to view the world as a subjective landscape instead of being "hard coded" one way or another has been far more enabling of social progress (including morality) than a hard code (such as the Bible) ever has been or will be. :sun