According to Webster; a doctrine or system of moral conduct: particular moral principles or rules of conduct

Taken from allaboutphilosophy.com

"Morality Defined

Morality speaks of a system of behavior in regards to standards of right or wrong behavior. The word carries the concepts of: (1) moral standards, with regard to behavior; (2) moral responsibility, referring to our conscience; and (3) a moral identity, or one who is capable of right or wrong action. Common synonyms include ethics, principles, virtue, and goodness. Morality has become a complicated issue in the multi-cultural world we live in today.

Morality as it relates to our behavior is important on three levels. Renowned thinker, scholar and author C.S. Lewis defines them as: (1) to ensure fair play and harmony between individuals; (2) to help make us good people in order to have a good society; and (3) to keep us in a good relationship with the power that created us. Based on this definition, it's clear that our beliefs are critical to our moral behavior.

On Point 1, Professor Lewis says most reasonable people agree. By Point 2, however, we begin to see problems occurring. Consider the popular philosophy "I'm not hurting anyone but myself," frequently used to excuse bad personal choices. How can we be the good people we need to be if we persist in making these choices, and how will that result not affect the rest of our society? Bad personal choices do hurt others. Point 3 is where most disagreement surfaces. While the majority of the world's population believes in God, or at least in a god, the question of Creation, as a theory of origins, is definitely hotly debated in today's society.

A recent report in Psychology Today concluded: "The most significant predictor of a person's moral behavior may be religious commitment. People who consider themselves very religious were least likely to report deceiving their friends, having extramarital affairs, cheating on their expenses accounts, or even parking illegally." Based on this finding, what we believe about Creation has a decided effect on our moral thinking and our behavior. Without belief in a Creator, the only option that seems to be left is to adhere to moral standards we make up for ourselves. Unless we live in a dictatorial society, we are free to choose our own personal moral code. But where does that freedom come from? The view of many who do not adhere to Creation is that morality is a creation of humanity, designed to meet the need of stable societies. All kinds of life are in a process of deciding between life and death, choosing what to do with power and/or authority. This ultimately leads to a system of virtues and values. The question is: what happens when our choices conflict with each other? What if something I believe I need in order for my life to continue results in death for you? If we do not have an absolute standard of truth, chaos and conflict will result as we are all left to our own devices and desires. "

Again, I ask, who will be the ultimate authority for what is moral and what isn't?