Human beings are social primates. So they have basic feelings of empathy and sociality built in, just as do other social primates like chimpanzees, bonobos, gorillas, baboons, and the like. These animals don’t get their social behavior from Scripture and neither do you. Morality finds its roots in human nature.
The above quote from the American Humanist Association is taken from here
Question: If morality finds its roots in HUMAN nature, how did the gorillas and chimpanzees get theirs?
Think of all the issues this raises: separate moralities?, should we do what primates do(to what extent, and who decides, and if there are different moralities - how can anyone say other's are wrong, and then where's accountability, etc.). Are we supposed to act based on all natural instincts? Not only this, but if morality finds its roots in human nature, then how can you cast off certain beliefs or values of individuals even if they differ from the majority (and if you do, who decides, etc.)? The list could go on and on.
Once again, humanism is unlivable with any real meaning, significance, or rational foundation and basis for accountability.