Where did Christianity originate from?

Jerusalem

Yes, if one city has to be named.

If you're looking for a country, it's Palestine.

Christianity originated from the region of Jerusalem, which is located in modern-day Israel. It emerged during the 1st century AD and is rooted in the teachings of Jesus Christ. The foundational beliefs and scriptures of Christianity, including the life, death, and resurrection of Jesus, were first preached and established in Jerusalem by Jesus and his disciples. The city of Jerusalem serves as a significant location in Christian history as it is where many key events of Jesus' life, ministry, crucifixion, and resurrection took place. Therefore, it can be said that Christianity has its roots in the city of Jerusalem.