Please see the following article to know who saint Patrick is and to know what he believed:
Patrick, the Christian Evangelist, being about 30 years old and together with some brothers in the Lord, set out for Ireland. He arrived in or about the year 405. This fact of history is authentic and verified. For example, Marcus, an Irish Bishop, who lived at the beginning of the ninth century, states that Patrick came to Ireland in the year 405 AD and Nennius, who lived about the same time, repeats the statement.15 This date is of great importance because many centuries later there was an attempt made to confuse Patrick with Palladius, who had been sent out by Pope Celestine as a missionary to Ireland. When news of Patrick’s Christian success had reached Rome, Pope Celestine then sent Palladius as a bishop to bring the churches under the control of the Papacy. It was in 432, at least 27 years after Patrick’s commission from God, that Palladius from Rome came on the scene. When Palladius did come to Ireland, it was to an Ireland that had many Christian churches and that did not accept his message of subservience to the Bishop of Rome. In actual fact, Palladius was greatly discouraged by his lack of success. To quote from the historian Philip Schaff, “Palladius was so discouraged that he soon abandoned the field, with his assistants, for north Britain, where he died among the Picts…The Roman mission of Palladius failed; the independent mission of Patrick succeeded. He is the true Apostle of Ireland, and has impressed his memory in indelible characters upon the Irish race at home and abroad.”16
BTW I live in Ireland and sadly on St Patricks day a lot of people get drunk and do many immoral things. So sadly there is not a lot of thought for God and His holiness.