As a social primate species, we modulate our morals with signals from family, friends, and social groups with whom we identify because in our evolutionary past, those attributes helped individuals to survive and reproduce.
Conformity to religion was important for survival for thousands of years, making religion a good example of natural selection among humans: To not believe was to risk being ostracized or killed. For billions of us this is still true today. Evolution is slow change…
Reason, Observation and Experience — the Holy Trinity of Science — have taught us that happiness is the only good; that the time to be happy is now, and the way to be happy is to make others so.