The Roman Catholic Church decides to split into two centers of power, one in Avignon and one in Rome, with a pope to lead both. This split is called the Great Schism. This weakened the the Church.
The townspeople were starting to become suspicious of the Church and how they spend the taxes they have to pay. The Church officials started to become
Right as people started to realize that the Church was corrupted, Martin Luther was one of the first to truly challenge the Church authorities. He felt as if he was a sinner and decides to write his Ninety-Five Theses. Many people agreed to Luther's ideas, and with that Luther unintentonally started a rebellion.
Printers began printing copies of the Bible in their local language, for Bibles were always in Latin. This helped promote Luther's rebellion once more and more Europeans learned to read and read the Bible.
As more people began to read the Bible, there were a lot of different ideas and interpretations of it. And because of the varying interpretations, these were the roots of many of the faiths now today.
After the Reformation started, the Church made use of the Inquisition. The Inquisition was a group of Church officials established by the court. They used intimidation and even tortute to get people to confess their sins.