Morality is a man-made concept.
Morality is a man-made concept that is defined by the society you live in; it is subjective. There is nothing called morality in nature. You cannot observe morality or test it in a laboratory. There is no absolute "morality."
Many religious fanatics have tried to prove that morality is an absolute, just like God is real. They have even developed philosophies to prove it, e.G., metaphysics, and epistemology, which use meaningless circular propositions to prove their points. They use word games to prove their points. Both assume that knowledge, morality, Good and Evil exist 'a priori'.
What does 'a priori' mean: 'a priori' knowledge, in Western philosophy since the time of Immanuel Kant, knowledge that is independent of all particular experiences, as opposed to a posteriori knowledge, which derives from experience. The Latin phrases a priori (“from what is before”) and a posteriori (“from what is after”) were used in philosophy originally to distinguish between arguments from causes and arguments from effects.
Even murdering or killing humans is not an absolute; it is societal, e.G., killing in war is OK, killing someone attacking you with deadly force where you are in fear of your life is OK.