It was the Apostle Paul .
The Apostle: "Paul", formerly "Saul of Tarsus"!
Christianity is the religion of the "gentiles"
He preached Christianity to the heathens in Ireland.
To spread Christianity to the gentiles.
it was paul _will_
To spread Christianity to the gentiles.
AnswerArguably, there are two persons who, more than any one else, were responsible for the spread of Christianity. The first of these was Paul, the "Apostle to the Gentiles", without whom Christianity could have remained a minor Jewish sect. The second is the fourth-century Emperor Cosntantine, who gave the Christian Church state patronage and began the process of converting the empire to Christianity.
Whose conversion?
Patrick was the one mostly responsible for the conversion of that country to Christianity.
But they most certainly were and Paul was their specially appointed Apostle by God.
No culture is 'responsible' for Christianity. Christianity is based on the death, burial and resurrection of Jesus Christ.
Costantine