yea, then you guys got papal infallibility
Papal Infallibility is the most misunderstood policy on the planet. Most people seem to think it means that a Pope cannot be wrong.
The Dogma of the Immaculate Conception (that Mary was given the grace to be free of sin from the moment of her conception is
one of three instances that fall directly under Papal Infallibility. The belief that Mary had been filled with grace from the moment of her conception had been around since early Christianity.
As early as the 700s some Christians were celebrating Mary's conception. By about the tenth century people were arguing over whether Mary's Immaculate conception should become formal Church doctrine. When these types of arguments come into play, it can take the Church a
very long time to make careful investigations and considerations. It generally starts with the people, goes to the priests and bishops, and then on to the Vatican.
Finally, in 1854 all the processes and procedures had been completed, and the dogma was written into a formal papal document (called a bull because it has a bulla, which is a seal). It was signed by Pope Pius IX and so the Immaculate Conception entered into Church Dogma. It became "
infallible" meaning that it cannot be removed even by a signature of a later pope.