“Saint” Patrick was a persecutor of Christians. He is often said to have brought Christianity to Ireland. That’s not true at all. He took Christianity away from Ireland, and brought it Roman Catholicism (which at that time was a heretical Calvinist-style Augustinianism).
You see, Christianity made it to Ireland as early as the 200s. But the Christianity there was independent of Rome until “Saint” Patrick the persecutor was sent, in 432 AD, to “drive out the snakes” (real Christians) and subjugate the place to Rome. He was specifically sent to persecute the so-called “Pelagians,” that is, those who believed in freewill and obeying the gospel rather than Augustine’s predestination and cosmic lottery.