Final answer:
Martin Luther's objections to the Roman Catholic Church, particularly the sale of indulgences, sparked his reformist ideas and led to the birth of Protestantism.
Step-by-step explanation:
Martin Luther's grievances with the Roman Catholic Church played a critical role in the development of his own ideology. His primary disagreement was with the practice of selling indulgences, a system where the Church claimed to forgive sins in exchange for money. Disgusted by this practice, Luther wrote and published the 95 Theses in 1517, a set of arguments against indulgences. Luther's arguments against indulgences sparked his reformist ideas, leading to the birth of Protestantism, a new branch of Christianity that emphasized the importance of faith over works and challenged the authority of the Pope. This marked a significant turning point in the history of Christianity.
Learn more about Martin Luther's Grievances and Protestantism