Christianity (from the Ancient Greek word Χριστός, Khristos, "Christ", literally "anointed one") is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings. Adherents of the Christian faith are known as Christians.
Christianity teaches that Jesus is the Son of God, God having become human and the saviour of humanity. Because of this, Christians commonly refer to Jesus as Christ or Messiah. The three largest groups in the world of Christianity are the Roman Catholic Church, the Eastern Orthodox churches, and the various denominations of Protestantism. The Roman Catholic and Eastern Orthodox patriarchates split from one another in the East–West Schism of 1054 AD, and Protestantism came into existence during the Protestant Reformation of the 16th century, splitting from the Roman Catholic Church.
Christians believe that Jesus is the Messiah prophesied in the Hebrew Bible, referred to as the "Old Testament" in Christianity. The foundation of Christian theology is expressed in the early Christian ecumenical creeds which contain claims predominantly accepted by followers of the Christian faith. These professions state that Jesus suffered, died, was buried, and was resurrected from the dead to open heaven to those who believe in him and trust him for the remission of their sins (salvation). They further maintain that Jesus bodily ascended into heaven where he rules and reigns with God the Father. Most denominations teach that Jesus will return to judge all humans, living and dead, and grant eternal life to his followers. He is considered the model of a virtuous life, and both the revealer and physical incarnation of God. Christians call the message of Jesus Christ the Gospel ("good news") and hence refer to the earliest written accounts of his ministry as gospels.