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#5 - Italy - 50,474,000 Catholics
Christianity arrived in Italy in the very first century, most likely brought there by traders and soldiers in the Roman army, according to most historians. Saint Paul's letter to the Romans is witness to the presence of Roman Christians in the very early days of Christianity. These communities were also with Saint Peter and Saint Clement, the latter being the first Italian pope, who wrote a letter to the Christian community in Corinth in the year 96.

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