The Reformation began as an attempt to reform the Roman Catholic Church, by priests who opposed what they perceived as false doctrines and ecclesiastic malpractice—especially the teaching and the sale of indulgences or the abuses thereof, and simony, the selling and buying of clerical offices—that the reformers saw as evidence of the systemic corruption of the Church's Roman Catholic Church hierarchy, which included the Pope.
Luther and his followers began a large exodus from the Roman Catholic Church known as the Protestant Reformation. Large numbers of Europeans left the Roman Church, including the majority of German speakers. Because Luther sparked this mass movement, he is known as the father of the Protestant Reformation, and the father of Protestantism in general. Which ended the arguments about religion.