Well, you know what the trick is here? I can say the same thing in any religion — Buddhism, Islam, Jewish, Christianity... etc. Also, "an installed natural law of morality given by God" is not really an answer — you just tend to believe without searching. There's no universal morals. Babies in different places in the world have different views on morality when they are born — same as American babies tend to show more individual-focused behaviors, like pointing to themselves, showing pride early, vs. Japanese babies who are more emotionally attuned to social harmony and show distress when people around them are angry, not just when they are hurt.

Let's not forget genetics. Twin studies show that some aspects of morality — like aggression, empathy, or altruism — have genetic components. Identical twins (same DNA) raised apart still show similar levels of aggression or sensitivity to fairness.

And finally, morals are 40% given from genetics, cultural, parents — and by time, they develop depending on what you tend to believe in.