Jesus Christ is the primary Christian religious figure. The New Testament of the Bible is based on the legendary stories of his life and the letters and articles written by him and his followers. He was born in the Holy Land but in the middle ages was distinguished from other Jews.
He is also called the Messiah, the Saviour, the son of God, or just Christ or Jesus. Islam just treats him as another major prophet for their god. Jews are still waiting for another to arrive as the true Messiah. The Eastern Orthodox Church based in Constantinople didn't really go with the Christian view of god being three things at once, especially ever a baby, so they didn't like the "son of God" approach and liked to pick on the Catholic Church for that and many other reasons.
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