The January issue of Smithsonian magazine has an excellent article on the continuing discovery of information that supports our new awareness that "the elements that underpin morality- altruism, sympathy for others" are in place in humans at a very early age. The article explains that natural selection has had as much or more influence on our social behavior than other things such as perception. The survival and reproduction of our species being dependent on social competence as we moved from basic mammals to eventually homo sapiens.
The study of infant behavior and there reactions to moral scenarios has proved extremely illuminating.
And all this occurs in a realm devoid of supernatural governance.