Evangelicalism (/ˌiːvænˈdʒɛlɪkəlˌɪzəm/, /ˌɛvən/-), Evangelical Christianity, or Evangelical Protestantism is a worldwide, transdenominational movement within Protestant Christianity which maintains the belief that the essence of the gospel consists of the doctrine of salvation by grace through faith in Jesus Christ's atonement. Evangelicals believe in the centrality of the conversion or the "born again" experience in receiving salvation, in the authority of the Bible as God's revelation to humanity, and in spreading the Christian message. The movement has had a long presence in the Anglosphere before spreading beyond it in the 20th and 21st centuries.