History of Christian theology
The doctrine of the Trinity, considered the core of Christian theology by Trinitarians, is the result of continuous exploration by the church of the biblical data, thrashed out in debate and treatises, eventually formulated at the First Council of Nicaea in AD 325 in a way they believe is consistent with the biblical witness, and further refined in later councils and writings.[1] The most widely recognized Biblical foundations for the doctrine's formulation are in the Gospel of John,[1] which possess ideas reflected in Platonism and Greek philosophy.[2]
Nontrinitarianism is any of several Christian beliefs that reject the Trinitarian doctrine that God is three distinct persons in one being. Modern nontrinitarian groups views differ widely on the nature of God, Jesus, and the Holy Spirit.
Historical theology is the academic study of the development of Christian theology.
Western theology[edit]
Before the Carolingian Empire[edit]
When the Western Roman Empire fragmented under the impact of various 'barbarian' invasions, the Empire-wide intellectual culture that had underpinned late Patristic theology had its interconnections cut. Theology tended to become more localised, more diverse, and more fragmented. The classical Christianity preserved in Italy by men like Boethius and Cassiodorus was different from the vigorous Frankish Christianity documented by Gregory of Tours which was different again from the Christianity that flourished in Ireland and Northumbria in the 7th and 8th centuries. Throughout this period, theology tended to be a more monastic affair, flourishing in monastic havens where the conditions and resources for theological learning could be maintained.
Important writers include:
Modern theology[edit]
After the Reformation Protestant groups continued to splinter, leading to a range of new theologies. The "Enthusiasts" were so named because of their emotional zeal. These included the Methodists, the Quakers and Baptists. Another group sought to reconcile Christian faith with "Modern" ideas, sometimes causing them to reject beliefs they considered to be illogical, including the Nicene creed and Chalcedonian Creed. These included Unitarians and Universalists. A major issue for Protestants became the degree to which Man contributes to his salvation. The debate is often viewed as synergism versus monergism, though the labels Calvinist and Arminian are more frequently used, referring to the conclusion of the Synod of Dort.
The 19th century saw the rise of biblical criticism, new knowledge of religious diversity in other continents and above all the growth of science. This led many church men to espouse a form of Deism. This, along with concepts such as the brotherhood of man and a rejection of miracles led to what is called "Classic Liberalism". Immensely influential in its day, classic liberalism suffered badly as a result of the two world wars and the criticisms of postmodernism.
Vladimir Lossky is an Eastern Orthodox theologian writing in the 20th century for the Greek church.
Modern Catholic response to Protestantism[edit]
Well into the 20th century, Catholics—even if no longer resorting to persecution—still defined Protestants as heretics. Thus, Hilaire Belloc – in his time one of the most conspicuous speakers for Catholicism in Britain – was outspoken about the "Protestant Heresy". He even defined Islam as being "A Christian heresy", on the grounds that Muslims accept many of the tenets of Christianity but deny the godhood of Jesus (see Hilaire Belloc#On Islam).
However, in the second half of the century – and especially in the wake of Vatican II – the Catholic Church, in the spirit of ecumenism, tends not to refer to Protestantism as a heresy, even if the teachings of Protestantism are heretical from a Catholic perspective. Modern usage favors referring to Protestants as "separated brethren" rather than "heretics", although the latter is still on occasion used vis-a-vis Catholics who abandon their church to join a Protestant denomination. Many Catholics consider Protestantism to be material rather than formal heresy, and thus non-culpable.
Some of the doctrines of Protestantism that the Catholic Church considers heretical are the belief that the Bible is the only source and rule of faith ("sola scriptura"), that faith alone can lead to salvation ("sola fide") and that there is no sacramental, ministerial priesthood attained by ordination, but only a universal priesthood of all believers.