The most basic expression of the identity of Jesus is simply the statement “Jesus is Lord!”. In Romans 10:9 and 1 Corinthians 12:3 Paul presented that statement as the essence of the Gospel. Jesus is the Son of God, as Peter correctly stated in Matthew 16:16.
The identity of Jesus has often been misunderstood. Claims about Jesus include thinking that he had only one nature, that he was two distinct persons, or that he was fully human but not fully divine.
However, orthodox Christianity has always maintained that Jesus was one person with two distinct natures – the nature of his humanity and the nature of his divinity. It was necessary for Jesus to be human so that he could die; it was necessary that Jesus be God so that he could be the perfect once-for-all sacrifice for sins.