What was one reason why Martin Luther's ideas to reform the church gain popularity?

Luther's belief in justification by faith led him to question the Catholic Church's practices of self-indulgence. He objected not only to the church's greed but to the very idea of indulgences. Over the next few years, however, his Ninety-Five Theses sparked a religious movement to reform the Catholic Church.

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hello,

  i would that it was because no matter how hard people worked everyone would be paid the same, witch it was a that the russian to rule.

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its c