I'm sorry, but this depends upon what you mean by "begin". Jesus was born in 3 AD, according to most scholars today, so that could be the beginning. He began his ministry at age 30, or AD 33, if that is the start of Christianity. His ministry lasted 3 years, so his crucifixion and resurrection occurred in AD 36, so that also would be a good start date.
If you mean where did Christianity begin, it began in Israel.
Christianity began in the 1st century AD in Jerusalem.
somewhere
where did Christianity begin?
indai
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.
Coptic Christianity began in Egypt about 55 A.D. It is one of the five oldest Christian churches in the world.
churches
1018
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.