Adherents of Christianity, known as Christians, believe that Jesus is the Son of God and the Messiah prophesied in the Hebrew Bible (the part of scripture common to Christianity and Judaism). The majority of orthodox Christian theology believe that Jesus suffered, died, and was resurrected to bring about salvation from sin. They further maintain that Jesus ascended into heaven, and most denominations teach that Jesus will return to judge all humans, living and dead, and grant immortality 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.

Like Judaism and Islam, Christianity is classified as an Abrahamic religion. Christianity began as a Jewish sect in the eastern Mediterranean, quickly grew in size and influence over a few decades, and by the 4th century had become the dominant religion within the Roman Empire. During the Middle Ages, most of the remainder of Europe was Christianized, with Christians also being a (sometimes large) religious minority in the Middle East, North Africa, and parts of India. Following the Age of Discovery, through missionary work and colonization, Christianity spread to the Americas and the rest of the world.

Christianity has played a prominent role in the shaping of Western civilization at least since the 4th century. As of the early 21st century, Christianity has between 1.5 billion and 2.1 billion adherents, representing about a quarter to a third of the world's population and is the world's largest religion.

Creeds

Creeds (from Latin credo meaning "I believe") are concise doctrinal statements or confessions, usually of religious beliefs. They began as baptismal formulas and were later expanded during the Christological controversies of the fourth and fifth centuries to become statements of faith.

The Apostles Creed (Symbolum Apostolorum) was developed between the second and ninth centuries. It is the most popular creed used in worship by Western Christians. Its central doctrines are those of the Trinity and God the Creator. Each of the doctrines found in this creed can be traced to statements current in the apostolic period. The creed was apparently used as a summary of Christian doctrine for baptismal candidates in the churches of Rome. Since the Apostles Creed is still unaffected by the later Christological divisions, its statement of the articles of Christian faith remain largely acceptable to most Christian denominations: