Well, St. Patrick was that man, and his writings have had unbelievable positive effects the world over. And he almost single-handedly converted the entire country of Ireland to Christianity. That's an info-war here, folks. That's a single man with nothing but the words that he uses and the truth that he's expressing, changing the destiny of an entire nation and in a way the entire world.

Well, this is very not true. St. Patrick absolutely did not convert all or even most of Ireland. For one thing, Christianity in Ireland predated his arrival, and the historical record is full of a bunch of other influences who likely had much larger effects on the history of the early church there.