If you are using our present calendar, I suppose that would be the year Christ was born, around 0 BC, if you believe that the Magi were the first believers (in the Christ). They certainly knew He was something special, or they wouldn't have traveled so far to see Him and bring Him presents. However, it could also be postulated that Christians didn't call themselves Christians until after they had heard Him teach (preach). Which would have been during the last three years of his life (Somewhere around 30-33 years after His birth). We know from history that the Roman's began persecuting Christians right around this time. Due to errors in the Julian calendar, we can't be certain exactly when these things occurred.
Another Answer:
Some scholars have dated the start of the Christian Church to Pentecost Sunday, June 17, 31 AD. This is 50 days after the Resurrection.
where did Christianity begin?
Because Jesus rose from the dead.
Yes you can say that as Christians follow his teachings .
It all began when god sent a message to David ( or somebody) that that God's son (Jesus) will be coming. That's when Christianity began (I think)
Christianity is said to have 'begun' at Pentecost, when the Holy Spirit descended to the apostles when they were in the upper room in Jerusalem. That would have been in ancient Israel.
30AD
Saint Paul
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Jesus Christ
Paul started Christianty
The Holy Bible.
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