Lutheranism has its roots in the efforts of Martin Luther who sought to reform the Western Church to a more biblical foundation.
Lutheranism is a major branch of Western Christianity that identifies with the teaching of Martin Luther, a 16th century German reformer. Luther's efforts to reform the theology and practice of the church launched the Protestant Reformation. The reaction of the government and church authorities to the international spread of his writings, beginning with the 95 Theses, divided Western Christianity.
The split between the Lutherans and the Roman Catholics arose mainly over the doctrine of Justification. Lutheranism advocates a doctrine of justification "by grace alone through faith alone because of Christ alone" which went against the Roman view of "faith formed by love", or "faith and works". Unlike the Reformed Churches, Lutherans retain many of the liturgical practices and sacramental teachings of the pre-reformation Church. Lutheran theology significantly differs from Reformed theology in Christology, the purpose of God's Law, divine grace, the concept of "once saved always saved", and predestination.
Traditionally, Lutherans hold the Bible of the Old and New Testaments to be the only divinely inspired book, the only source of divinely revealed knowledge, and the only norm for Christian teaching. Scripture alone is the formal principle of the faith, the final authority for all matters of faith and morals because of its inspiration, authority, clarity, efficacy, and sufficiency.