The Western Christianity reference article from the English Wikipedia on 24-Apr-2004
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Western Christianity

Western Christianity refers collectively to Catholicism and Protestantism, especially when speaking more about what they share in common than about the ways they differ. As opposed to Eastern Christianity, these sects of Christianity dominated mostly and were historically developed in the western half of Europe, hence the name. One of the principal respects in which Western Christianity differs from Eastern Christianity is its doctrine of original sin. Today, however, the geographical distinction between Western and Eastern Christianity is not nearly as absolute, especially after the spread missionaries.