St. Peter's Church is a church located in the town of Bailey, Colorado. It made its only appearance in the Season Nine episode "Bloody Mary".
Background
When a priest at St. Peter's Church witnesses the statue of the Virgin Mary bleeding out its ass one night, he takes it to the news, where several people believe it was a miracle. When a cardinal shows up to look at the statue, it sprays blood in his face and he says that is in fact a miracle. Randy Marsh has an idea to look at the statue himself so it can "cure" his alcoholism. However, after Randy gets "cured", Pope Benedict XVI arrives at the statue to check it out, where he says that the statue bleeding out its ass is not a miracle and that "chicks bleed out their vaginas all the time", which leads Randy to believe that his alcoholism wasn't cured.