Claim: Jesus is also called Jesus Christ.

In Christian theology , the doctrine of the Incarnation holds that Jesus , the preexistent divine Logos -LRB- Koine Greek for `` Word '' -RRB- and the second hypostasis of the Trinity , God the Son and Son of the Father , taking on a human body and human nature , `` was made flesh '' and conceived in the womb of Mary the Theotokos -LRB- Greek for `` God-bearer '' ; -RRB- . The doctrine of the Incarnation , then , entails that Jesus Christ is fully God and fully human , his two natures joined in hypostatic union .   In the Incarnation , as traditionally defined by those Churches that adhere to the Council of Chalcedon , the divine nature of the Son was united but not mixed with human nature in one divine Person , Jesus Christ , who was both `` truly God and truly man '' . This is central to the traditional faith held by most Christians . Alternative views on the subject -LRB- See Ebionites and the Gospel of the Hebrews -RRB- have been proposed throughout the centuries -LRB- see below -RRB- , but all were rejected by mainstream Christian bodies . An alternative doctrine known as `` Oneness '' has been espoused among various Pentecostal groups -LRB- see below -RRB- .   The Incarnation is commemorated and celebrated each year at Christmas , and also reference can be made to the Feast of the Annunciation ; `` different aspects of the mystery of the Incarnation '' are celebrated at Christmas and the Annunciation .