Why did Martin Luther's actions spark the Reformation?

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Martin Luther's actions sparked the Reformation because he openly criticized harmful practices of the Catholic Church. Specifically, Luther objected to the sale of indulgences, which were essentially a way for people to buy forgiveness for their sins. He also believed that salvation came from faith alone, rather than good works or other actions prescribed by the Church. These criticisms led to Luther being excommunicated from the Church, but they also inspired a rebellion against the Church's authority and the emergence of new religious movements in Europe.

Why Did Martin Luther's Actions Spark the Reformation