When trying to convince someone about the morality (or immorality) of a given action, there often seems to be little progress made. In my experience, this is usually the result of the other person having different beliefs about the foundation of moral values and duties. As a Catholic Christian, I believe that moral values and duties are objective realities created by God. They are not arbitrary "rules" that God made up – they flow from God's very nature. If God is the Summum Bonum or Highest Good, and He created the universe for a purpose, it follows that an action carried out in His Creation is objectively good and moral to the extent that it conforms to His purpose. It is very inconsistent (and sometimes, comical) when skeptics or atheists try to maintain the existence of objective moral values and duties, that is, "values and duties that are real and binding on all people, regardless of time, place, or culture," without God as their source.
Missing the Point
This is the most misunderstood aspect of Christian morality. Non-believers will often say, "I don't need to believe in God to be a good person," "Why can't we just be good people and leave religion out of this?" and, "Isn't it better to just be good because you want to, instead of doing so because some two-thousand-year-old book tells you to, or because you're afraid of going to Hell?" The truth is, no reasonable Christian will claim that an atheist or agnostic cannot live their life in a moral way, and the only thing statements and questions like these prove is that the person offering them is completely missing the point of the argument. The argument is NOT that belief in God is necessary for a person to act morally. Rather, it is that the existence of God is necessary.
It's Not "My" Truth, it's "The" Truth
Today, a particularly insidious obstacle to the task of education is the massive presence in our society and culture of that relativism which, recognizing nothing as definitive, leaves as the ultimate criterion only the self with its desires. And under the semblance of freedom it becomes a prison for each one, for it separates people from one another, locking each person into his or her own 'ego'.
The House Built on Rock
Catholic Biblical Association (Great Britain). The Holy Bible: Revised Standard Version, Catholic Edition. New York: National Council of Churches of Christ in the USA, 1994. Print.