The doctrine of the incarnation is the central point of Christianity. It is the belief that the second person of the Holy Trinity, the Logos, the Son of God, became flesh. He was miraculously conceived in the Theotokos (The Mother of God, Mary). Christians hold that Jesus was fully God and fully man.
And the Word became flesh and dwelt among us, full of grace and truth; we have beheld his glory, glory as of the only Son from the Father. John1:14
For in him the whole fullness of deity dwells bodily. Colossians 2:9
There is the claim by some, maybe you have heard this, that the story of the incarnation is based on older non-Christian tales. Hearing this can makes us doubt the truth proclaimed by the Church for two millennia. The question arises in the hearts of some whether the Church’s tradition; scripture, councils, saints, icons and liturgy are based on a lie or some fairy tale. Do away with the incarnation and there are no hooks left to hang any trust in the claims of Jesus Christ about Himself, His teachings on Love and creation. In fact, doing away with the incarnation changes Christianity into Hinduism. For some reason Christians themselves are often the first to embrace the doubts. Maybe we have decided that there must be more to the story of Jesus. Maybe we have decided that He is simply to good to be true.
David Bentley Hart in “The Beauty of the Infinite” remarks that Rudolf Bultmann’s “Jesus Christ and Mythology,” “reproduces an error that the story of the incarnation obeys the dramatic morphology of certain preexisting gnostic savior myths; this is, however, at best extremely speculative: not only is there no evidence of such myths in existence prior to Christianity, the only Gnostic systems in which such myths appear (and they are fewer than one might imagine) are those that have been demonstrably influences by Christian thought.” (Notes, page 23)