October 29, 2017 is Reformation Sunday. It is the Sunday closest to the date Martin Luther nailed his 95 Theses to the door of the Whittenburg Castle church. The document raised questions and propositions for debate. It was intended to lead to a meaningful discussion among Catholics, in the hope it would cause a reform to the institution.
The institution did not accept the invitation to meaningfully discuss the issues raised, and instead of reflecting on their own conduct, they condemned Martin Luther. Martin Luther was a devout Catholic. His questions were sincere. His loyalty to the institution was unaffected by the errors he saw in the scandalous selling of indulgences to finance projects in Rome.
Rome believed itself above criticism. They assumed their historic control was a right conferred by God. Therefore, the sincerity of Martin Luther and the legitimacy of his questions and propositions meant nothing to the institution. They branded Luther a heretic and threatened his life. This was the worst possible approach for Catholicism, and the best possible result for Christianity.