Atonement in Christianity

In western Christian theology, describes how human beings can be reconciled to God through Christ's sacrificial death. Atonement refers to the forgiving or pardoning of sin in general and original sin in particular through the death and resurrection of Jesus, enabling the reconciliation between God and his creation. Within Christianity there are, historically, three or four main theories for how such atonement might work:

Other theories include recapitulation theory, the "shared atonement" theory and scapegoat theory.

The English word 'atonement' originally meant "at-one-ment", i.e. being "at one", in harmony, with someone. It is used to describe the saving work that God did through Christ to reconcile the world to himself, and also of the state of a person having been reconciled to God. Throughout the centuries, Christians have used different metaphors and given differing explanations of the atonement to express how the atonement might work. Churches and denominations may vary in which metaphor or explanation they consider most accurately fits into their theological perspective; however all Christians emphasize that Jesus is the Saviour of the world and through his death the sins of humanity have been forgiven. The four most well known theories are briefly described below:

One of the earliest explanations for how the atonement works is nowadays often called the moral influence theory. In this view the core of Christianity is positive moral change, and the purpose of everything Jesus did was to lead humans toward that moral change. He is understood to have accomplished this variously through his teachings, example, founding of the Church, and the inspiring power of his martyrdom and resurrection. Some scholars suggest this view was universally taught by the Church Fathers in the 2nd and 3rd centuries AD, along with what is called by Aulén the classical or patristic view, which can be variously interpreted as Ransom or Recapitulation, or under the general heading of "Christus Victor". The moral influence theory also enjoyed popularity during the Middle Ages and is most often associated in that period with Peter Abelard. Since the Reformation it has been advocated by modern philosophers like Immanuel Kant, and many theologians such as Hastings Rashdall and Paul Tillich. It remains the most popular view of atonement among theologically liberal Christians. It also forms the basis for René Girard’s "mimetic desire" theory (not to be confused with meme theory). It would be a mistake, however, to read this theory, or any of the theories, in isolation from the others.

...
Wikipedia