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Western Christianity is a branch of Christianity, composed of the Latin Church and Protestantism, together with their offshoots such as Independent Catholicism and Restorationism. The large majority of the world's 2.1 billion Christians are Western Christians (about 2 billion – 1.2 billion Latin Catholic and 800 million Protestant). The original and still major part, the Latin Church, developed under the bishop of Rome (the Patriarch of the West) in the former Western Roman Empire in Antiquity. Out of the Latin Church emerged a wide variety of independent Protestant denominations, including Lutheranism and Anglicanism, starting from the Protestant Reformation in the 16th century, as did Independent Catholicism in the 19th century. Thus, the term "Western Christianity" does not describe a single communion or religious denomination, but is applied to distinguish all these denominations collectively from Eastern Christianity.
The establishment of the distinct Latin Church, a particular church sui iuris of the Catholic Church (in contrast to the Eastern Catholic Churches, also in full communion with the Pope in Rome) coincided with the consolidation of the Holy See in Rome, which claimed primacy since Antiquity. The terms "Western" and "Eastern" in this regard originated with geographical divisions mirroring the cultural divide between the Hellenistic east and Latin West, and the political divide between the Western and Eastern Roman empires. During the Middle Ages adherents of the Latin Church, irrespective of ethnicity, commonly referred to themselves as "Latins" to distinguish themselves from Eastern Christians.
With the expansion of European colonialism from the Early Modern era, the Latin Church, in time along with its Protestant secessions, spread throughout the Americas, much of the Philippines, Southern Africa, pockets of West Africa, and throughout Australia, and New Zealand. Thus, when used for historical periods after the 16th century, the term "Western Christianity" does not refer to a particular geographical area, but is rather used as a collective term for all these.
Today, the geographical distinction between Western and Eastern Christianity is not nearly as absolute as in Antiquity or the Middle Ages, due to the spread of Christian missionaries, migrations, and globalisation. As such, the adjectives "Western Christianity" and "Eastern Christianity" are typically used to refer to historical origins and differences in theology and liturgy, rather than present geographical locations.
While the Latin Church maintains the use of the Latin liturgical rites, Protestant denominations and Independent Catholicism use a wide variety of liturgical practices.
For most of its history the church in Europe has been culturally divided between the Latin-speaking west, whose centre was Rome, and the Greek-speaking east, whose centre was Constantinople. Cultural differences and political rivalry created tensions between the two churches, leading to disagreement over doctrine and ecclesiology and ultimately to schism.
Like Eastern Christianity, Western Christianity traces its roots directly to the apostles and other early preachers of the religion. In Western Christianity's original area Latin was the principal language. Christian writers in Latin had more influence there than those who wrote in Greek, Syriac, or other Eastern languages. Though the first Christians in the West used Greek (such as Clement of Rome), by the fourth century Latin had superseded it even in the cosmopolitan city of Rome, while there is evidence of a Latin translation of the Bible in the 2nd century (see also Vetus Latina) in southern Gaul and the Roman province of Africa.
With the decline of the Roman Empire, distinctions appeared also in organization, since the bishops in the West were not dependent on the Emperor in Constantinople and did not come under the influence of the Caesaropapism in the Eastern Church. While the see of Constantinople became dominant throughout the Emperor's lands, the West looked exclusively to the see of Rome, which in the East was seen as that of one of the five patriarchs of the Pentarchy, "the proposed government of universal Christendom by five patriarchal sees under the auspices of a single universal empire. Formulated in the legislation of the emperor Justinian I (527–565), especially in his Novella 131, the theory received formal ecclesiastical sanction at the Council in Trullo (692), which ranked the five sees as Rome, Constantinople, Alexandria, Antioch, and Jerusalem."
Over the centuries, disagreements separated Western Christianity from the various forms of Eastern Christianity: first from East Syriac Christianity after the Council of Ephesus (431), then from that of Oriental Orthodoxy after the Council of Chalcedon (451), and then from Eastern Orthodoxy with the East-West Schism of 1054. With the last-named form of Eastern Christianity, reunion agreements were signed at the Second Council of Lyon (1274) and the Council of Florence (1439), but these proved ineffective.
In and after the Age of Discovery, Europeans spread Western Christianity to the New World and elsewhere. Roman Catholicism came to the Americas (especially South America), Africa, Asia, Australia and the Pacific. Protestantism, including Anglicanism, came to North America, Australia-Pacific and some African locales.
Today, the geographical distinction between Western and Eastern Christianity is now much less absolute, due to the great migrations of Europeans across the globe, as well as the work of missionaries worldwide over the past five centuries.
Although "original sin" can be taken to mean the sin that Adam committed, it is usually understood as a consequence of the first sin, the hereditary stain with which we are born on account of our origin or descent from Adam. With the exception of tendencies such as Pelagianism, Western Christianity is thought to hold this doctrine, which was championed especially by Saint Augustine, who wrote: "The deliberate sin of the first man is the cause of original sin" (De nupt. et concup., II, xxvi, 43).
Most Western Christians use a version of the Nicene Creed that states that the Holy Spirit "proceeds from the Father and the Son", where the original text as adopted by the First Council of Constantinople had "proceeds from the Father" without the addition of either "and the Son" or "alone". This Western version also has the additional phrase "God from God" (in Latin Deum de Deo), which was in the Creed as adopted by the First Council of Nicaea, but which was dropped by the First Council of Constantinople.
The date of Easter usually differs between Eastern and Western Christianity, because the calculations are based on the Julian calendar and Gregorian calendar respectively. However, before the Council of Nicea various dates including Jewish Passover were observed. Nicea "Romanized" the date for Easter and anathematized a "Judaized" (i.e. Passover date for) Easter. The date of observance of Easter has only differed in modern times since the promulgation of the Gregorian calendar in 1582; and further, the Western Church did not universally adopt the Gregorian calendar at once, so that for some time the dates of Easter differed as between the Eastern Church and the Roman Catholic Church, but not necessarily as between the Eastern Church and the Western Protestant churches. For example, the Church of England continued to observe Easter on the same date as the Eastern Church until 1753.
Even the dates of other Christian holidays differ between Eastern and Western Christianity.
Today, Western Christianity makes up close to 90% of Christians worldwide with the Catholic Church accounting for over half and various Protestant denominations making up another 40%.
Hussite movements of 15th century Bohemia preceded the main Protestant uprising by 100 years and evolved into several small Protestant churches, such as the Moravian Church. Waldensians survived also, but blended into the Reformed tradition.