Martin Luther was convinced that man can surely attain redemption by dint of his unflinching faith in Jesus as a Savior. Faith alone saves. Whereas the Catholic Church maintained that mere faith in Jesus cannot save a man unless his faith is completed by love and good deeds. Now, how much love and goodness a man must have to qualify for salvation was unknown.
Another big disagreement that Martin Luther had with the Catholic Church was about the question, “Who is the highest authority in Christianity?” The Catholic Church believed in absolute authority and supremacy of the Pope of Rome. Martin Luther was totally convinced that Christ alone is the head of Christianity and the ultimate authority indeed.
Martin Luther rejected the claim of the Catholic Church that the Pope is divinely appointed head of Christendom. Luther was strongly opposed to pope Boniface VIII’s claim in the bull, "Unam Sanctum" that no one can be saved unless he submits to the Roman Pope. Arbitrary and unlimited powers had made the Catholic Church corrupt and morally bankrupt; Martin Luther strongly raised his voice against this corruption, much to the chagrin and anger of the Catholic Church.
He nailed his 95 theses on the gate of the Church of Wittenberg, accusing the Catholic Church of corruption and heresy. This bold action on his part is deemed as the real beginning of the Protestant Reformation. The Protestant movement spread quickly because people were sick and tired of the papal corruption and the idea that God could be realized through a direct communication arrested their imagination and gave them a lot of peace of mind that evaded them till now.
