Christianity (from the Ancient Greek: Χριστιανός Christianos and the Latin suffix -itas) is a monotheistic and Abrahamic religion based on the life and teachings of Jesus Christ as presented in canonical gospels and other New Testament writings as well as the Old Testament. Most adherents of the Christian faith, known as Christians, believe that Jesus is the Son of God, fully divine and fully human and the savior of humanity prophesied in the Old Testament. Consequentially, Christians commonly refer to Jesus as Christ or Messiah.

The foundation of Christian theology is expressed in the early ecumenical creeds which contain claims predominantly accepted by followers of the Christian faith. These professions state that Jesus suffered, died, was buried, and was subsequently resurrected from the dead in order to grant eternal life to those who believe in him and trust him for the remission of their sins. 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 his ministry, crucifixion, and resurrection are often referred to as the gospel, meaning "Good News" (from the Greek: εὐαγγέλιον euangélion).