Reformed Christianity is a branch of Protestantism that emerged in the 16th century during the Reformation. It emphasizes the sovereignty of God, the authority of Scripture, and the necessity of grace through faith. Key figures include John Calvin and Martin Luther, who advocated for a return to biblical teachings and a rejection of certain practices of the Roman Catholic Church. Reformed Christians often adhere to the Westminster Confession of Faith and other confessions that outline their beliefs. They focus on the doctrines of predestination and the importance of living a life that reflects their faith. Worship in Reformed churches typically emphasizes preaching and teaching from the Bible.