HOW APOSTLE PAUL CHRISTIANIZED THE GENTILE WORLD?

HOW APOSTLE PAUL CHRISTIANIZED THE GENTILE WORLD/
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St. Paul was an apostle (though not one of the 12 apostles) who taught the gospel of Christ in the 1st century to most of the gentile world. He is generally considered as one of the most important figures of the early christians. In around 33AD to 50AD he had established several Christian communities mostly in Europe, specially in Turkey, Greece, Malta, Spain, Rome and other places. He took advantage of his status being both a Jew and a Roman Citizen to minister both Jewish and Roman audiences.
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We should remember that there was no complete Christian Bible during the time of Christ and the Apostles. In fact, those 13 of the 27 books of the New Testament have been taken from the letters of Paul, which were only considered inspired writings 300 years after his death. St. Paul and his disciples (e.g. Timothy, Luke, Barnabas, etc) have been preaching to the gentile countries without using a Bible, unlike what Protestants are doing today. It's because the Church had already existed before the bible was compiled.
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Now we will track those places which were preached by Apostle Paul. We can read in Acts 28:1 that St. Paul had visited the Island country of Malta, which was a former pagan nation. After Paul had preached there, Maltese were gradually converted to Catholicism. Since then, the official religion of the Republic of Malta is Catholicism. And around 94% of the population of Malta are Catholics.
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We will track the journey of Apostle Paul to Spain. In Romans 15:24, St. Paul also had went to Spain which was a former pagan country. The nation had also been gradually converted to Catholicism, and was once the official religion of the state. During the Spanish Empire, several Spanish and Portuguese missionaries had sailed off to Asian and American continents, bringing Catholicism to many countries of the world. Thus, It was the Spaniards whose responsible for the christianization of the former pagan countries like