Martin Luther in the context of "Eastern Lutheranism"

Christianity is the largest religion in Germany. It was introduced to the area of modern Germany by 300 AD, while parts of that area belonged to the Roman Empire, and later, when Franks and other Germanic tribes converted to Christianity from the fifth century onwards. The area became fully Christianized by the time of Charlemagne in the eighth and ninth century. After the Reformation started by Martin Luther in the early 16th century, many people left the Catholic Church and became Protestant, mainly Lutheran and Reformed. In the 17th and 18th centuries, German cities also became hubs of heretical and sometimes anti-religious freethinking, challenging the influence of religion and contributing to the spread of secular thinking about morality across Germany and Europe.

Protestantism is a branch of Christianity that emphasizes justification of sinners through faith alone, the teaching that salvation comes by unmerited divine grace, the priesthood of all believers, and the Bible as the sole infallible source of authority for Christian faith and practice. The five solae summarize the basic theological beliefs of mainstream Protestantism.

Protestants follow the theological tenets of the Protestant Reformation, a movement that began in the 16th century with the goal of reforming the Catholic Church from perceived errors, abuses, and discrepancies. The Reformation began in the Holy Roman Empire in 1517, when Martin Luther published his Ninety-five Theses as a reaction against abuses in the sale of indulgences by the Catholic Church, which purported to offer the remission of the temporal punishment of sins to their purchasers. Luther's statements questioned the Catholic Church's role as negotiator between people and God, especially when it came to the indulgence arrangement, which in part granted people the power to purchase a certificate of pardon for the penalization of their sins. Luther argued against the practice of buying or earning forgiveness, claiming instead that salvation is a gift God gives to those who have faith.

Adamantios Korais or Koraïs (Greek: Ἀδαμάντιος Κοραῆς [aðaˈmandi.os koraˈis]; Latin: Adamantius Coraes; French: Adamance Coray; 27 April 1748 – 6 April 1833) was a Greek scholar credited with laying the foundations of modern Greek literature and a major figure in the Greek Enlightenment. His activities paved the way for the Greek War of Independence and the emergence of a purified form of the Greek language, known as Katharevousa. Encyclopædia Britannica asserts that "his influence on the modern Greek language and culture has been compared to that of Dante on Italian and Martin Luther on German".

Evangelicalism (/ˌiːvænˈdʒɛlɪkəlɪzəm, ˌɛvæn-, -ən-/), also called evangelical Christianity or evangelical Protestantism, is a worldwide, interdenominational movement within Protestant Christianity that emphasizes evangelism, or the preaching and spreading of the Christian gospel. The term evangelical is derived from the Koine Greek word euangelion, meaning "good news," in reference to the message of salvation through Jesus Christ. Evangelicalism typically places a strong emphasis on personal conversion, often described as being "born again", and regards the Bible as the ultimate authority in matters of faith and practice. The definition and scope of evangelicalism are subjects of debate among theologians and scholars. Some critics argue that the term encompasses a wide and diverse range of beliefs and practices, making it difficult to define as a coherent or unified movement.

The theological roots of evangelicalism can be traced to the Protestant Reformation in 16th-century Europe, particularly Martin Luther's 1517 Ninety-five Theses, which emphasized the authority of Scripture and the preaching of the gospel over church tradition. The modern evangelical movement is generally dated to around 1738, influenced by theological currents such as Pietism, Puritanism, Quakerism, and Moravianism—notably the work of Nicolaus Zinzendorf and the Herrnhut community. Evangelicalism gained momentum during the First Great Awakening, with figures like John Wesley and the early Methodists playing central roles.

Lutheranism or Evangelical Lutheranism is a major branch of Protestantism that emerged under the work of Martin Luther, the 16th-century German friar and reformer whose efforts to reform the theology and practices of the Catholic Church launched the Reformation in 1517. The Lutheran Churches adhere to the Bible and the Ecumenical Creeds, with Lutheran doctrine being explicated in the Book of Concord. Lutherans hold themselves to be in continuity with the apostolic church and affirm the writings of the Church Fathers and the first four ecumenical councils.

The schism between Roman Catholicism and Lutheranism, which was formalized in the Edict of Worms of 1521, centered on two points: the proper source of authority in the church, often called the formal principle of the Reformation, and the doctrine of justification, the material principle of Lutheran theology. Lutheranism advocates a doctrine of justification "by Grace alone through faith alone on the basis of Scripture alone", the doctrine that scripture is the final authority on all matters of faith. This contrasts with the belief of the Roman Catholic Church, defined at the Council of Trent, which contends that final authority comes from both Scripture and tradition. In Lutheranism, tradition is subordinate to Scripture and is cherished for its role in the proclamation of the Gospel.

The Moravian Church, or the Moravian Brethren, formally the Unitas Fratrum (Latin: "Unity of the Brethren"), is one of the oldest Protestant denominations in Christianity, dating back to the Bohemian Reformation of the 15th century and the original Unity of the Brethren (Czech: Jednota bratrská) founded in the Kingdom of Bohemia, sixty years before Martin Luther's Reformation.

The church's heritage can be traced to 1457 and the Lands of the Bohemian Crown, which included Bohemia, Moravia, Silesia, and previously the Hussite movement against several practices and doctrines of the Catholic Church. Its name is derived from exiles who fled from Moravia to Saxony in 1722 to escape the Counter-Reformation, establishing the Christian community of Herrnhut. Hence, it is also known in German as the Herrnhuter Brüdergemeine [sic] ("Unity of Brethren of Herrnhut").