
Christianity is a global religion centered on the life and teachings of Jesus Christ, who followers believe is the Son of God. It's a monotheistic faith, meaning Christians believe in one God who exists in three co-equal persons: God the Father, God the Son (Jesus Christ), and the Holy Spirit. Christianity is based on the Bible, with the Old Testament and New Testament serving as sacred texts.

In Christianity and Islam, it is asserted that Jesus of Nazareth was conceived by his mother Mary solely through divine intervention and without sexual intercourse, thus resulting in his virgin birth. In accordance with these beliefs, Jesus had just one biological parent instead of the necessary two; Mary's husband Joseph was his father only in the legal sense. Most Christians hold that Mary's virginity was perpetual. Though not biologically related, Jesus being Joseph's adoptive son is cited as linking him to the Davidic line. The Christian understanding is that the birth of Jesus by a virgin woman was made possible by the Holy Spirit of the Trinity.

The Christian doctrine of the Trinity (Latin: trinus "threefold") holds that God is one God, but three coeternal consubstantial persons or hypostases. These being the Father, the Son (Jesus Christ), and the Holy Spirit - as "one God in three Divine Persons". The three Persons are distinct, yet are one "substance, essence or nature" (homoousios).