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Christianity
Christianity (from the word X??st?? "Christ") is a monotheistic religion centered on the life and teachings of Jesus as presented in the New Testament.

Its followers, known as Christians, believe that Jesus is the begotten Son of God and the Messiah (Christ) prophesied in the Hebrew Bible (the part of scripture common to Christianity and Judaism). To Christians, Jesus Christ is a teacher, the model of a virtuous life, the revealer of God,as well as an incarnation of God, and most importantly the savior of humanity who suffered, died, and was resurrected to bring about salvation from sin. Christians maintain that Jesus ascended into heaven, and most denominations teach that Jesus will return to judge the living and the dead, granting everlasting life to his followers. Christians call the message of Jesus Christ the Gospel ("good news") and hence label the written accounts of his ministry as gospels.

Like Judaism and Islam, Christianity is classified as an Abrahamic religion (see also Judeo-Christian). 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.

Jesus Christ
The central tenet of Christianity is the belief in Jesus as the Son of God and the Messiah (Christ). The title "Messiah" comes from the Hebrew word ???????? (mašiáh) meaning anointed one. The Greek translation ???st?? (Christos) is the source of the English word "Christ".
Christians believe that, as the Messiah, Jesus was anointed by God as ruler and savior of humanity, and hold that Jesus' coming was the fulfillment of messianic prophecies of the Old Testament. The Christian concept of the Messiah differs significantly from the contemporary Jewish concept. The core Christian belief is that, through the death and resurrection of Jesus, sinful humans can be reconciled to God and thereby are offered salvation and the promise of eternal life.
According to the Gospels of Matthew and Luke, Jesus was conceived by the Holy Spirit and born from the Virgin Mary. Little of Jesus' childhood is recorded in the canonical Gospels, however infancy Gospels were popular in antiquity. In comparison, his adulthood, especially the week before his death, are well documented in the Gospels contained within the New Testament. The Biblical accounts of Jesus' ministry include: his baptism, miracles, preaching, teaching, and deeds.

Death and resurrection of Jesus
Christians consider the resurrection of Jesus to be the cornerstone of their faith (see 1 Corinthians 15) and the most important event in human history. Among Christian beliefs, the death and resurrection of Jesus are two core events on which much of Christian doctrine and theology is based. According to the New Testament Jesus was crucified, died a physical death, buried within a tomb, and rose from the dead three days later. The New Testament mentions several resurrection appearances of Jesus on different occasions to his twelve apostles and disciples, including "more than five hundred brethren at once," before Jesus' Ascension to heaven. Jesus' death and resurrection are commemorated by Christians in all worship services, with special emphasis during Holy Week which includes Good Friday and Easter Sunday.

The death and resurrection of Jesus are usually considered the most important events in Christian Theology, partly because they demonstrate that Jesus has power over life and death and therefore has the authority and power to give people eternal life.

Christian churches accept and teach the New Testament account of the resurrection of Jesus with very few exceptions.. Some modern scholars use the belief of Jesus' followers in the resurrection as a point of departure for establishing the continuity of the historical Jesus and the proclamation of the early church. Some liberal Christians do not accept a literal bodily resurrection, seeing the story as richly symbolic and spiritually nourishing myth. Arguments over death and resurrection claims occur at many religious debates and interfaith dialogues. Paul the Apostle, an early Christian convert and missionary, wrote, "If Christ was not raised, then all our preaching is useless, and your trust in God is useless." The Unitarian church is one of the few in which a resurrection of Jesus is not a doctrine.[citation needed]

Salvation
Protestantism teaches that eternal salvation is a gift that comes to an individual by God's grace, sometimes defined as "unmerited favor", on the basis of one's personal belief in and dependence on the substitutionary death and resurrection of Jesus Christ. Salvation in this sense refers to God's activities in bringing humans into right relationship with God and with one another through faith in Jesus Christ. It is the belief that one can be saved (rescued) from sin and eternal death. Other concepts used in the study of how salvation is accomplished include conversion, faith, justification, regeneration, and others. Many Protestants believe in the "assurance of salvation" — that God can give the confidence that a believer in Jesus as the Christ has truly received salvation.

Trinity

Trinity refers to the teaching that the one God comprises three distinct, eternally co-existing persons; the Father (from whom the Son and Spirit proceed), the Son (incarnate in Jesus Christ), and the Holy Spirit. Together, these three persons are sometimes called the Godhead, although there is no single term in use in Scripture to denote the unified Godhead. In the words of the Athanasian Creed, an early statement of Christian belief, "the Father is God, the Son is God, and the Holy Spirit is God, and yet there are not three Gods but one God".

The Trinity is an essential doctrine of mainstream Christianity. "Father, Son and Holy Spirit" represents both the immanence and transcendence of God. God is believed to be infinite and God's presence may be perceived through the actions of Jesus Christ and the Holy Spirit.

Scriptures
Main articles: Bible and Development of the Christian Biblical canon
Christianity regards the Bible, a collection of canonical books in two parts (the Old Testament and the New Testament), as authoritative. It is believed by Christians to have been written by human authors under the inspiration of the Holy Spirit, and therefore for many it is held to be the inerrant word of God