Christianity as an officil religion began in Jerusalem after Jesus had ascended and his followers began preaching the good news of the kingdom. Although they were still Jews by race, they were Christians by faith. However, these early believers were not called "Christians". "Christians" only began being called thus when the religion spread to Antioch, where the word meant, "Follower of Christ."
Though not officially known as Christianity, the teachings of Christ have been known since the time of Adam. For Adam received instruction from deity from the time he and Eve were banished from the garden of Eden. These same teaching were then given to their children. No one can say with any certainty just when it started after the time of Adam and Eve.
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.
Martian Luther