Protestantism is a movement within Christianity that originated in the sixteenth-century Protestant Reformation. It is considered to be one of the three principal traditions of Christianity, together with Roman Catholicism and Eastern Orthodoxy.
Protestantism is associated with the belief that the Bible (rather than church tradition or ecclesiastical interpretations of the Bible) is the final source of authority for Christians. Another salient feature of Protestant theology is its doctrine that salvation comes through faith alone, by the grace of God.
The word Protestant is derived from the Latin protestari   meaning publicly declare which refers to the letter of protestation by Lutheran princes against the decision of the Diet of Speyer in 1529, which reaffirmed the edict of the Diet of Worms in 1521, banning Luther's documents. Since that time, the term Protestantism has been used in many different senses, often as a general term merely to signify that they are not Roman Catholics.
While churches which historically emerged directly or indirectly from the Protestant Reformation generally constitute traditional Protestantism, in common usage the term is often used to refer to any Christian church other than the Roman Catholic Church and the Eastern Orthodox Churches. This usage is imprecise, however, as there are non-Roman Catholic and non-Eastern Orthodox churches which predate the Reformation (notably Oriental Orthodoxy). Anglicans, although historically influenced by the Protestant Reformation in what is called the English Reformation, differs from many Reformation principles and understands itself to be a middle path—a via media—between Roman Catholic and Protestant doctrines. Other groups, such as the Mormons and Jehovah's Witnesses, reject traditional Protestantism as another deviation from Christianity, while perceiving themselves to be restorationists.
The three fundamental principles of traditional Protestantism are the following:
The belief in the Bible as the sole infallible authority.
The subjective principle of the Reformation is justification by faith alone, or, rather, by free grace through faith operative in good works. It has reference to the personal appropriation of the Christian salvation, and aims to give all glory to Christ, by declaring that the sinner is justified before God (i.e. is acquitted of guilt, and declared righteous) solely on the ground of the all-sufficient merits of Christ as apprehended by a living faith, in opposition to the theory — then prevalent, and substantially sanctioned by the Council of Trent — which makes faith and good works co-ordinate sources of justification, laying the chief stress upon works. Protestantism does not depreciate good works; but it denies their value as sources or conditions of justification, and insists on them as the necessary fruits of faith, and evidence of justification.
The universal priesthood of believers implies the right and duty of the Christian laity not only to read the Bible in the vernacular, but also to take part in the government and all the public affairs of the Church. It is opposed to the hierarchical system, which puts the essence and authority of the Church in an exclusive priesthood, and makes ordained priests the necessary mediators between God and the people.
Trinitarian Protestant denominations are divided according to the position taken on Baptism:
There are many independent, non-aligned or non-denominational trinitarian congregations that may take any one of these or no particular position on Baptism.
Some religious movements, such as Restorationists, Nontrinitarian movements, or the New Religious Movements, which share certain characteristics of the Protestant churches, are termed 'Protestant' by outsiders, even though neither mainstream Trinitarian Christians, nor the groups themselves, would consider the designation appropriate.
See main article: Protestants by country. Protestants often refer to specific Protestant churches and groups as denominations to imply that they are differently named parts of the whole church. This "invisible unity" is assumed to be imperfectly displayed, visibly: some denominations are less accepting of others, and the basic orthodoxy of some is questioned by most of the others. Individual denominations also have formed over very subtle theological differences. Other denominations are simply regional or ethnic expressions of the same beliefs. Because the five solas are the main tenets of the Protestant faith, many Non-denominational churches are also Protestant churches. The actual number of distinct protestant denominations is hard to calculate, but has been estimated to be over thirty thousand.
Various ecumenical movements have attempted cooperation or reorganization of Protestant churches, according to various models of union, but divisions continue to outpace unions, as there is no overarching authority to which any of the sects owe allegiance, which can authoritatively define the faith. Most denominations share common beliefs in the major aspects of the Christian faith, while differing in many secondary doctrines, although what is major and what is secondary is a matter of idiosyncratic belief. There are "over 33,000 denominations in 238 countries" and every year there is a net increase of around 270 to 300 denominations. According to David Barrett's study (1970), there are 8,196 denominations within Protestantism.
There are about 800 million Protestants worldwide, among approximately 1.5 billion Christians.  These include 170 million in North America, 160 million in Africa, 120 million in Europe, 70 million in Latin America, 60 million in Asia, and 10 million in Oceania.
Protestants can be differentiated according to how they have been influenced by important movements since the magisterial Reformation and the Puritan Reformation in England. Some of these movements have a common lineage, sometimes directly spawning later movements in the same groups. Only general families are listed here (due to the above-stated multitude of denominations); some of these groups do not consider themselves as part of the Protestant movement, but are generally viewed as such by the public at large:
See main article: Five solas. The Five Solas are five Latin phrases -(or slogans) that emerged during the Protestant Reformation and summarize the Reformers' basic theological beliefs in opposition to the teaching of the Roman Catholic Church of the day. The Latin word sola means "alone," "only," or "single" in English. The five solas were what the Reformers believed to be the only things needed in their respective opinions for Christian salvation. The Bible was taught as the only norm. Listing them as such was also done with a view to excluding other things that in the Reformers' respective views hindered or were unnecessary for salvation. This formulation was intended to distinguish between what were viewed as deviations in the Christian church and the essentials of Christian life and practice. In these opinions they differed from the universal consensus of Christians in historical Christianity.
The Protestants characterize the dogma concerning the Pope as Christ's representative head of the Church on earth, the concept of meritorious works, and the Catholic idea of a treasury of the merits of saints, as a denial that Christ is the only mediator between God and man. Catholics, on the other hand, maintained the traditions of Judaism on these questions, and appealed to the universal consensus of Christian tradition, that Peter and his successors were mandated by Jesus Christ as his vicars on earth after his ascension, to keep his followers united.(Matt. 16:18, 1 Cor. 3:11, Eph. 2:20, 1 Pet. 2:5–6, Rev. 21:14).
Protestants believe that the teachings of the Roman Catholic Church obscure the teachings of the Bible by conflating it with church tradition and Popish doctrine. Protestants therefore see Scripture as the sole authority in matters of faith and practice. Catholics believe that the Holy Spirit (according to Scripture) guides the Church into the fullness of truth and therefore led the Catholic Church into a more sophisticated understanding of revelation in history, (Matthew 10:19; Mark 13:11; Luke 12:11, 21:14). This places the Roman Catholic magisterium over Scripture.
Protestants believe that faith in Christ alone is enough for eternal salvation as described in , whereas Catholics believe that the phrases "faith without works is dead," (as stated in ) and "Ye see then how that by works a man is justified, and not by faith only" (); points to the justified person needing to persevere in charity. Protestants, pointing to the same scripture, believe that practicing good works merely attest to one's faith in Christ and his teachings.
Protestants perceived Roman Catholic salvation to be dependent upon the grace of God and the merits of one's own works. The Reformers posited that salvation is a gift of God (i.e., God's act of free grace), dispensed by the Holy Spirit owing to the redemptive work of Jesus Christ alone. Consequently, they argued that a sinner is not accepted by God on account of the change wrought in the believer by God's grace, and that the believer is accepted without regard for the merit of his works — for no one deserves salvation. Catholics believed that faith was not just a belief, but a way of life, and in both lay salvation, not faith alone. (Matt.7:21)
All glory is due to God alone, since salvation is accomplished solely through his will and action - not only the gift of the all-sufficient atonement of Jesus on the cross but also the gift of faith in that atonement, created in the heart of the believer by the Holy Spirit. The reformers believed that human beings - even saints canonized by the Roman Catholic Church, the popes, and the ecclesiastical hierarchy - are not worthy of the glory that was accorded them. On these bases they considered themselves justified in forming new denominations at war with the Catholic Church, rather than sharing its mission.
The Protestant movement began to coalesce into several distinct branches in the mid-to-late sixteenth century. One of the central points of divergence was controversy over the Lord's Supper.
Early Protestants generally rejected the Roman Catholic dogma of transubstantiation, which teaches that the bread and wine used in the sacrificial rite of the Mass lose their natural substance by being transformed into the Body, Blood, Soul, and Divinity of Christ. They disagreed with one another concerning the manner in which Christ is present in Holy Communion.
Some hold to understandings like those of Lutherans, Calvinists, or Zwinglians, while others hold doctrines very similar (or even identical) to the Roman Catholic doctrine of transubstantiation.
In Protestant theology, as the bread shares identity with Christ (which he calls "my body"), in an analogous way, the Church shares identity with Christ (and also is called "the Body of Christ"). Thus, controversies over the Lord's Supper may seem to be only about the nature of the bread and wine, but are ultimately about the nature of salvation and the Church; and indirectly about the nature of Christ. There are as many different views on the question as there are Protestant denominations.
Contrary to how the Protestant reformers were often characterized, the concept of a catholic, or universal, Church was not brushed aside during the Protestant Reformation. To the contrary, the visible unity of the Catholic Church was an important and essential doctrine of the Reformation. The Magisterial Reformers, such as Martin Luther, John Calvin, and Ulrich Zwingli, believed that they were reforming a corrupt and heretical Catholic Church. Each of them took very seriously the charges of schism and innovation, denying these charges and maintaining that it was the medieval Roman Catholic Church that had left them; notwithstanding that they were individuals in the 16th century who espoused radically different opinions from what was the common and constant teaching of the Christian Church hitherto.
The visible church, in the idea of the Scottish theologians, is "catholic", rather than "Catholic". You have not an indefinite number of Parochial, or Congregational, or National churches, constituting, as it were, so many ecclesiastical individualities, but one great spiritual republic, of which these various organizations form a part, notwithstanding that they each have very different opinions. The visible church is not a genus, so to speak, with so many species under it. It is thus you may think of the State, but the visible church is a totum integrale, it is an empire, with an ethereal emperor, rather than a visible one. The churches of the various nationalities constitute the provinces of this empire; and though they are so far independent of each other, yet they are so one, that membership in one is membership in all, and separation from one is separation from all... This conception of the church, of which, in at least some aspects, we have practically so much lost sight, had a firm hold of the Scottish theologians of the seventeenth century.
Wherever the Magisterial Reformation, which received support from the ruling authorities, took place, the result was a reformed national church envisioned to be a part of the whole visible Holy catholic Church described in the creeds, but disagreeing, in certain important points of doctrine and doctrine-linked practice, with what had until then been considered the normative reference point on such matters, namely the See of Rome. The Reformed Churches thus believed in a form of Catholicity, founded on their doctrines of the five solas and a visible ecclesiastical organization based on the 14th and 15th century Conciliar movement, rejecting the Papacy and Papal Infallibility in favor of Ecumenical councils, but rejecting the Council of Trent. Catholic unity therefore became not one of doctrine and identity, but one of invisible character, wherein the unity was one of faith in Jesus Christ, not common identity, belief, and collaborative action.
Today there is a growing movement of Protestants, especially of the Reformed tradition, that reject the designation "Protestant" because of its negative "anti-catholic" connotations, preferring the designation "Reformed," "Evangelical" or even "Reformed Catholic" expressive of what they call a "Reformed Catholicity" and defending their arguments from the traditional Protestant Confessions.
The official Roman Catholic view on the matter is that the Protestant communities do not form a Church, but rather that they are mere ecclesial communities because they do not all have true sacraments and authentic apostolic succession. On June 29 2007 the Congregation for the Doctrine of the Faith, under the presidency of William Cardinal Levada signed an official document called "Responses to Some Questions Regarding Certain Aspects of the Doctrine on the Church".
Unlike mainstream Evangelical (Lutheran), Reformed (Zwinglian and Calvinist) Protestant movements, the Radical Reformation, which had no state sponsorship, generally abandoned the idea of the "Church Visible" as distinct from the "Church Invisible". It was a rational extension of the State-approved Protestant dissent, which took the value of independence from constituted authority a step further, arguing the same for the civic realm.
In the view of many associated with the Radical Reformation, the Magisterial Reformation had not gone far enough, with radical reformer, Andreas von Bodenstein Karlstadt, for example, referring to the Lutheran theologians at Wittenberg as the "new papists". A more political side of the Radical Reformation can be seen in the thought and practice of Hans Hut, although typically Anabaptism has been associated with pacifism.
Early Anabaptists were severely persecuted by both Calvinist and Catholic civil authorities.
The German Pietist movement, together with the influence of the Puritan Reformation in England in the seventeenth century, were important influences upon John Wesley and Methodism, as well as new groups such as the Religious Society of Friends ("Quakers") and the Moravian Brethren from Herrnhut, Saxony, Germany.
The practice of a spiritual life, typically combined with social engagement, predominates in classical Pietism, which was a protest against the doctrine-centeredness Protestant Orthodoxy of the times, in favor of depth of religious experience. Many of the more conservative Methodists went on to form the Holiness movement, which emphasized a rigorous experience of holiness in practical, daily life.
See main article: Evangelicalism.
Beginning at the end of eighteenth century, several international revivals of Pietism (such as the Great Awakening and the Second Great Awakening) took place across denominational lines, largely in the English-speaking world. Their teachings and successor groupings are referred to generally as the Evangelical movement. The chief emphases of this movement were individual conversion, personal piety and Bible study, public morality often including Temperance and Abolitionism, de-emphasis of formalism in worship and in doctrine, a broadened role for laity (including women) in worship, evangelism and teaching, and cooperation in evangelism across denominational lines.
See main article: Adventism.
Adventism, as a movement, began in the United States in middle nineteenth century. The Adventist family of churches are regarded today as conservative Protestants.
See main article: Liberal Christianity.
Modernism, Liberalism and Sunderianism do not constitute rigorous and well-defined schools of theology, but are rather an inclination by some writers and teachers to integrate Christian thought into the spirit of the Age of Enlightenment. New understandings of history and the natural sciences of the day led directly to new approaches to theology.
See main article: Pentecostalism.
Pentecostalism, as a movement, began in the United States early in the twentieth century, starting especially within the Holiness movement. Seeking a return to the operation of New Testament gifts of the Holy Spirit, speaking in tongues as evidence of the "baptism of the Holy Ghost" or to make the unbeliever believe became the leading feature. Divine healing and miracles were also emphasized. Pentecostalism swept through much of the Holiness movement, and eventually spawned hundreds of new denominations in the United States. A later "charismatic" movement also stressed the gifts of the Spirit, but often operated within existing denominations, rather than by coming out of them.
See main article: Christian fundamentalism.
In reaction to liberal Bible critique, fundamentalism arose in the twentieth century, primarily in the United States and Canada, among those denominations most affected by Evangelicalism. Fundamentalism placed primary emphasis on the authority and sufficiency of the Bible, and typically advised separation from error and cultural conservatism as an important aspect of the Christian life.
See main article: Neo-orthodoxy.
A non-fundamentalist rejection of liberal Christianity, associated primarily with Karl Barth, neo-orthodoxy sought to counter-act the tendency of liberal theology to make theological accommodations to modern scientific perspectives. Sometimes called "Crisis theology", according to the influence of philosophical existentialism on some important segments of the movement; also, somewhat confusingly, sometimes called neo-evangelicalism.
See main article: Evangelicalism.
Evangelicalism is a movement from the middle of the twentieth century, that reacted to perceived excesses of Fundamentalism, adding to concern for biblical authority, an emphasis on liberal arts, cooperation among churches, Christian Apologetics, and non-denominational evangelization.
See main article: Paleo-orthodoxy.
Paleo-orthodoxy is a movement similar in some respects to Neo-evangelicalism but emphasising the ancient Christian consensus of the undivided Church of the first millennium AD, including in particular the early Creeds and councils of the church as a means of properly understanding the Scriptures. This movement is cross-denominational and the theological giant of the movement is United Methodist theologian Thomas Oden.
See main article: Christian ecumenism.
The ecumenical movement has had an influence on mainline churches, beginning at least in 1910 with the Edinburgh Missionary Conference. Its origins lay in the recognition of the need for cooperation on the mission field in Africa, Asia and Oceania. Since 1948, the World Council of Churches has been influential, but ineffective in creating a united Church. There are also ecumenical bodies at regional, national and local levels across the globe; but schisms still far outnumber unifications. One, but not the only expression of the ecumenical movement, has been the move to form united churches, such as the Church of South India, the Church of North India, The US-based United Church of Christ, The United Church of Canada, Uniting Church in Australia and the United Church of Christ in the Philippines which have rapidly declining memberships. There has been a strong engagement of Orthodox churches in the ecumenical movement, though the reaction of individual Orthodox theologians has ranged from tentative approval of the aim of Christian unity to outright condemnation of the perceived effect of watering down Orthodox doctrine.http://www.intratext.com/IXT/ENG0804/__P1T.HTM
A Protestant baptism is held to be valid in a Catholic Church because it is generally Trinitarian in nature. However, Protestant ministers are not mutually recognized. Therefore, laymen who convert are not re-baptized, although ministers are re-ordained as clergymen (cf Apostolicae Curae).
In 1999, the representatives of Lutheran World Federation and Roman Catholic Church signed The Joint Declaration on the Doctrine of Justification, apparently resolving the conflict over the nature of Justification which was at the root of the Protestant Reformation, although some conservative Lutherans did not agree to this resolution. This is understandable, since there is no compelling authority within them. On July 18, 2006 Delegates to the World Methodist Conference voted unanimously to adopt the Joint Declaration. http://www.umc.org/site/c.gjJTJbMUIuE/b.1863123/k.FF49/World_Methodists_approve_further_ecumenical_dialogue.htm http://www.catholicnews.com/data/stories/cns/0604186.htm
A fraternity of French Protestant hermits.