How did Martin Luther's ideas and message start a schism in the Roman Catholic Church in Europe?

Martin Luther wrote the 95 Theses that criticized the practices of the Catholic Church. At the time, the Catholic Church was executing the practice of indulgences, which were also known as buying forgiveness for certain sins. When Martin Luther began criticizing these practices, he was excommunicated from the Church and condemned as a criminal by the Pope. He then became a key figure in the Reformation of the Roman Catholic Church.

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