Augustine and Pelagius were two of the great theologians of the 4th century whose work has an effect on the theology of Christianity today which is concentrated in the areas of original sin and free arbitrariness. Sin can be defined as everything that does not express or conform to the holy character of God. The question of sin is not in its definition but in its origin. Augustine and Pelagius were two people with two different views on the origin of sin. Pelagius, was a faithful British monk who argued that we came into the world with free will. This free will allows us to choose whether to sin or not. Our sin is based on our actions. We are considered like Adam before the fall. Augustine argued that a good and infinite God creates only good. The evil that man does is caused by the bad decisions he chooses to make. This could be supported by the story of Job where we see that Job decided not to sin despite his circumstances (Job 1:22). Pelagius believed that what Adam did was an isolated event and exclusively independent of the rest of the human race. However, Augustine believed that what Adam did greatly affected the rest of humanity. We are all involved in Adam's fall and have been given a sinful nature as a result. Whether we agree with Augustine or Pelagius, we must understand human sin and make bad decisions. But it is through the grace of God that we are given the opportunity to be renewed and forgiven and we are given the opportunity to walk in the ways and will of God. The theology of moral rigorism - Pelagius, focuses on free will and Sin. Adam and Eve were created with free and neutral will. They had the ability to make their own choices whether to be good or bad. They had an obligation to do good. Just as the Scriptures, in the center of the paper, understand that humans sin and make bad decisions. But it is through the grace of God that we are given the opportunity to be renewed and forgiven and given the opportunity to walk in the ways and will of God. In my opinion, Augustine's argument offers great proof of the need of a savior and the need for redemption that only Christ can offer. The fall in the garden was not the original sin, according to Augustine, but the child's original sin is the first individual sin that he commits based on his own choices and free will. It is through God's irresistible grace and redemption that we are restored to the freedom that gives us both the freedom to sin and the freedom not to sin. Before we accept conversion and God's divine grace, our overwhelming passions and desires lead us to sin. God's grace gives us the control and restraint we need, as well as true freedom of choice and free will.