The main evidence was the general support that the Protestant Reformation, started by Martin Luther and Ninety-five Theses , gathered in Germany.
Luther's thesis, and in turn, the Reformation movement questioned some practices and dogmas of the Catholic Christian church and started a movement, which ended up as the largest schism in Western Christianity.
Luther started criticizing the sale of indulgences, considering it a mechanism that church leaders invented to gain monetary profit by deceiving their congregations. People paid the money required to secure their access to heaven after having commited sins, and believed so would happen due to their intense faith and general the lack of education. They did not question the intentions of the church leaders. In turn, Luther claimed that the Pope, nor the bishops, had the power to grant access to heaven or purgatory, depending on the purchase of such products.