Only Son of God

According to the predominant Christian interpretation, the title "Son of God" is understood as an expression of Jesus' divinity and, specifically, his unique divine sonship as the Second Person of the Trinity.
The title is applied often in the Gospels, notably at the Baptism and the Transfiguration (Matthew 3:17, Matthew 17:5). Also significant is the confession of Peter: "You are the Christ, the Son of the Living God" (Matthew 16:16). Jesus applies the title "the only Son of God" to himself in John 3:16 and 10:36. John's gospel uses the title as a short formula for expressing his divinity: "We have beheld his glory, glory as of the only Son from the Father, full of grace and truth" (John 1:14).
This view is held by virtually all Christians, even most non-Trinitarians, though obviously not by those groups which do not believe that Jesus was divine. These groups, especially Liberal Christians, generally do not accept the theology of the canonical epistles, and reject the historicity of the specific events in the Gospels. Thus, because in the Old Testament the title "a son of God" was given to various creatures (e.g., angels, the children of Israel, Jewish kings, and specifically the promised Messiah), they understand it as nothing more than belief in Jesus' Messiahship.