in the time of Patrick there was only one christian church - pre orthodox, reformation etc. today he is "claimed" by all christian churches as the patron saint and you will find as many protestant churches dedicated to him as catholic ones. in terms of Christianity, then, he helped spread its beliefs throughout the northern part of the Ireland in particular. he was not the first christian missionary. he himself said he was sent by the pope as a bishop to the christians of Ireland.
No, the Catholic Church has not desanctified Saint Patrick. He remains a revered saint in the Catholic tradition, known for his missionary work and contributions to the spread of Christianity in Ireland.
It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church. Of course not, Catholic Orders are valid.
Commonly invoked against snakes, sins, and withcraft, Saint Patrick is honored in the Catholic Church, Eastern Catholic Church, Eastern Orthodox Church, Anglicanism, and Lutheranism. Baptists are unmentioned.
St. Peter's Basilica is a Roman Catholic church located in Vatican City, the sovereign city-state of the Holy See. It is the main church in the Catholic faith and a significant pilgrimage site for Catholics worldwide.
Of course, St. Maximilian Kolbe was baptized.
St. Patrick's Day, formally "the feast of Patrick, Patron of Ireland"
St Patrick's day is technically Catholic as Patrick is the Patron Saint of Ireland. He would have been beatified by the catholic church. St Patrick's day is a celebration of his life. However, it is not really a religious festival.
St. Boniface Roman Catholic Church was created in 1882.
St. Josaphat's Roman Catholic Church was created in 1889.
St. Brigitte Roman Catholic Church was created in 1909.
St. Hedwig's Roman Catholic Church was created in 1904.
St. Casimir's Roman Catholic Church was created in 1917.
St. Michael's Roman Catholic Church was created in 1836.
St. Rocco's Roman Catholic Church was created in 1926.
St. Louis Roman Catholic Church was created in 1889.
St. Gertrude Roman Catholic Church was created in 1911.
St. Catherine of Siena Roman Catholic Church was created in 1929.