What did Luther do about the church and their idea?

Martin Luther challenged the Catholic Church's practices and doctrines, particularly the sale of indulgences, which he viewed as corrupt. In 1517, he famously nailed his Ninety-Five Theses to the church door in Wittenberg, criticizing these practices and calling for reform. Luther's actions sparked the Protestant Reformation, leading to the establishment of alternative Christian denominations and a significant shift in religious authority and theology. His emphasis on faith and scripture over church tradition reshaped Christianity in Europe.