Truly Christianity began in Judaism, but if you're asking why did they split up, it is because Christians believe Jesus is the Messiah, aka son of God, Jews claim that he is not.
If you mean where did Christianity begin, it began in Israel.
Christianity began in the 1st century AD in Jerusalem.
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where did Christianity begin?
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There are no secrets of or in Christianity. If you are asking what is the secret of success in Christianity that would be fully trusting in the Lord and begin obedient to Him.
Isreal. Specifically Jeruselum.
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Christianity means followers of Jesus Christ. After the passing on of Jesus, the Apostle came together to continue the work. This was the start of Christianity in Jerusalem.
In the area now known as Israel/Palestine.
It started after the death of Jesus Christ.