The beginning of Christianity was in Israel at Pentecost when the Holy Spirit came on the disciples to form the Catholic Church.
I think defined not redefined, because that was just the beginning of Christianity so Paul was defining what Christianity is.
Christianity is often considered as beginning at Pentecost, most likely in 33 AD.
Check out the book of Acts in the Bible.
Well, if you mean the start within the beliefs then the answer is in the beginning of time, if you mean the separation between Judaism and Christianity then the birth of Jesus in Bethlehem and the belief of him being the Messiah, if you mean the beginning of the followers this would be in Israel.
Jesus Jesus Christ was the beginning of Christianity. Paul tought Christianity after Christ and his appostles were killed off.
In the area currently called Israel/Palestine.
The life and death of Jesus, the acts of the apostles.
It has always been the Church from the beginning.
Christianity started with Jesus Christ and his followers. They originally were Jewish but "branched off" to form a religion that accepted non-Jews.
Some of the problems encountered when defining the beginning of the Middle Ages is determining the beginning of Christianity and coinciding that with the fall of Rome.
The roman religion consisted of a large amount of Gods. Christianity has one God. The Romans didn't like that.
Thomas was responsible to bring Christianity to India.