Characteristic of Christianity in the 19th century were evangelical revivals in some largely Protestant countries and later the effects of modern biblical scholarship on the churches. Liberal or modernist theology was one consequence of this. In Europe, the Catholic Church strongly opposed liberalism and culture wars launched in Germany, Italy, Belgium and France. It strongly emphasized personal piety. In Europe there was a general move away from religious observance and belief in Christian teachings and a move towards secularism. In Protestantism, pietistic revivals were common.

Modernism in Christian theology

As the more radical implications of the scientific and cultural influences of the Enlightenment began to be felt in the Protestant churches, especially in the 19th century, Liberal Christianity, exemplified especially by numerous theologians in Germany in the 19th century, sought to bring the churches alongside of the broad revolution that modernism represented. In doing so, new critical approaches to the Bible were developed, new attitudes became evident about the role of religion in society, and a new openness to questioning the nearly universally accepted definitions of Christian orthodoxy began to become obvious.

In reaction to these developments, Christian fundamentalism was a movement to reject the radical influences of philosophical humanism, as this was affecting the Christian religion. Especially targeting critical approaches to the interpretation of the Bible and trying to blockade the inroads made into their churches by atheistic scientific assumptions, the fundamentalists began to appear in various denominations as numerous independent movements of resistance to the drift away from historic Christianity. Over time, the Fundamentalist Evangelical movement has divided into two main wings, with the label Fundamentalist following one branch, while Evangelical has become the preferred banner of the more moderate movement. Although both movements primarily originated in the English speaking world, the majority of Evangelicals now live elsewhere in the world.

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 the Baptists. Another group sought to reconcile Christian faith with modernist 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 people contribute to their 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 Christians to emphasize the brotherhood, to seeing miracles as myths, and to emphasize a moral approach with religion as lifestyle rather than revealed truth.

Liberal Christianity Liberal Christianity—sometimes called liberal theology—reshaped Protestantism. Liberal Christianity is an umbrella term covering diverse, philosophically informed movements and moods within 19th and 20th century Christianity. Despite its name, liberal Christianity has always been thoroughly protean. The word liberal in liberal Christianity does not refer to leftist politics but rather to insights developed during the Age of Enlightenment. Generally speaking, Enlightenment-era liberalism held that people are political creatures and that liberty of thought and expression should be their highest value. The development of liberal Christianity owes a lot to the works of theologian Friedrich Schleiermacher.Brian Albert Gerrish, A prince of the church: Schleiermacher and the beginnings of modern theology (Fortress Press, 1984).Gary J. Dorrien, The Making of American Liberal Theology: Imagining Progressive Religion, 1805–1900 (John Knox Press, 2001). As a whole, liberal Christianity is a product of a continuing philosophical dialogue.Réville, Jean. Liberal Christianity: Its Origin, Nature, and Mission (1904).

Protestant Europe

Historian Kenneth Scott Latourette argues that the outlook for Protestantism at the start of the 19th century was discouraging. It was a regional religion based in northwestern Europe, with an outpost in the sparsely settled United States. It was closely allied with government, as in Scandinavia, the Netherlands, Prussia, and especially Great Britain. The alliance came at the expense of independence, as the government made the basic policy decisions, down to such details as the salaries of ministers and location of new churches. The dominant intellectual currents of the Enlightenment promoted rationalism, and most Protestant leaders preached a sort of deism. Intellectually, the new methods of historical and anthropological study undermine automatic acceptance of biblical stories, as did the sciences of geology and biology. Industrialization was a strongly negative factor, as workers who moved to the city seldom joined churches. The gap between the church and the unchurched grew rapidly, and secular forces, based both in socialism and liberalism undermine the prestige of religion. Despite the negative forces, Protestantism demonstrated a striking vitality by 1900. Shrugging off Enlightenment rationalism, Protestants embraced romanticism, with the stress on the personal and the invisible. Entirely fresh ideas as expressed by Friedrich Schleiermacher, Soren Kierkegaard, Albrecht Ritschl and Adolf von Harnack restored the intellectual power of theology. There was more attention to historic creeds such as the Augsburg, the Heidelberg, and the Westminster confessions. The stirrings of pietism on the Continent, and evangelicalism in Britain expanded enormously, leading the devout away from an emphasis on formality and ritual and toward an inner sensibility toward personal relationship to Christ. Social activities, in education and in opposition to social vices such as slavery, alcoholism and poverty provided new opportunities for social service. Above all, worldwide missionary activity became a highly prized goal, proving quite successful in close cooperation with the imperialism of the British, German, and Dutch empires.Kenneth Scott Latourette, Christianity in a Revolutionary Age, II: The Nineteenth Century in Europe: The Protestant and Eastern Churches (1959) pp 428–31

Britain In England, Anglicans emphasized the historically Catholic components of their heritage, as the High Church element reintroduced vestments and incense into their rituals, against the opposition of Low Church evangelicals.Owen Chadwick, Victorian Church (2 vol. 1979) As the Oxford Movement began to advocate restoring traditional Catholic faith and practice to the Church of England (see Anglo-Catholicism), there was felt to be a need for a restoration of the monastic life. Anglican priest John Henry Newman established a community of men at Littlemore near Oxford in the 1840s. From then forward, there have been many communities of monks, friars, sisters, and nuns established within the Anglican Communion. In 1848, Mother Priscilla Lydia Sellon founded the Anglican Sisters of Charity and became the first woman to take religious vows within the Anglican Communion since the English Reformation. In October 1850, the first building specifically built for the purpose of housing an Anglican Sisterhood was consecrated at Abbeymere in Plymouth. It housed several schools for the destitute, a laundry, printing press, and a soup kitchen. From the 1840s and throughout the following hundred years, religious orders for both men and women proliferated in Britain, America and elsewhere.Thomas Jay Williams, Priscilla Lydia Sellon: the restorer after three centuries of the religious life in the English church (SPCK, 1965).

Germany

Two main developments reshaped religion in Germany. Across the land, there was a movement to unite the larger Lutheran and the smaller Reformed Protestant churches. The churches themselves brought this about in Baden, Nassau, and Bavaria. However, in Prussia, King Frederick William III was determined to handle unification entirely on his own terms, without consultation. His goal was to unify the Protestant churches, and to impose a single standardized liturgy, organization, and even architecture. The long-term goal was to have fully centralized royal control of all the Protestant churches. In a series of proclamations over several decades the Church of the Prussian Union was formed, bringing together the more numerous Lutherans, and the less numerous Reformed Protestants. The government of Prussia now had full control over church affairs, with the king himself recognized as the leading bishop. Opposition to unification came from the "Old Lutherans" in Silesia who clung tightly to the theological and liturgical forms they had followed since the days of Martin Luther. The government attempted to crack down on them, so they went underground. Tens of thousands migrated, to South Australia, and especially to the United States, where they formed what is now the Lutheran Church–Missouri Synod, which remains a conservative denomination. Finally, in 1845, the new king, Frederick William IV, offered a general amnesty and allowed the Old Lutherans to form a separate church association with only nominal government control.Christopher Clark, Iron Kingdom (2006) pp 412–19Christopher Clark, "Confessional policy and the limits of state action: Frederick William III and the Prussian Church Union 1817–40." Historical Journal 39.04 (1996) pp: 985–1004. in JSTORHajo Holborn, A History of Modern Germany 1648–1840 (1964) pp 485–91

From the religious point of view of the typical Catholic or Protestant, major changes were underway in terms of a much more personalized religiosity that focused on the individual more than the church or the ceremony. The rationalism of the late 19th century faded away, and there was a new emphasis on the psychology and feeling of the individual, especially in terms of contemplating sinfulness, redemption, and the mysteries and the revelations of Christianity. Pietistic revivals were common among Protestants.

American trends The main trends in Protestantism included the rapid growth of Methodist and Baptists denominations, and the steady growth among Presbyterians, Congregationalists and Anglicans. After 1830 German Lutherans arrived in large numbers; after 1860 Scandinavian Lutherans arrived. The Pennsylvania Dutch Protestant sects (and Lutherans) grew through high birth rates.

Second Great Awakening

The Second Great Awakening (1790-1840s) was the second great religious revival in America. Unlike the First Great Awakening of the 18th century, it focused on the unchurched and sought to instill in them a deep sense of personal salvation as experienced in revival meetings. It also sparked the beginnings of groups such as the Mormons Presbyterian historian Matzko notes that "Oliver Cowdery claimed that Smith had been 'awakened' during a sermon by the Methodist minister George Lane." and the Holiness movement. Leaders included Asahel Nettleton, Edward Payson, James Brainerd Taylor, Charles Grandison Finney, Lyman Beecher, Barton W. Stone, Peter Cartwright, and James Finley.

In New England, the renewed interest in religion inspired a wave of social activism. In western New York, the spirit of revival encouraged the emergence of the Restoration Movement, the Latter Day Saint movement, Adventism, and the Holiness movement. Especially in the west—at Cane Ridge, Kentucky and in Tennessee—the revival strengthened the Methodists and the Baptists and introduced into America a new form of religious expression—the Scottish camp meeting.