Final answer:
Martin Luther's use of the printing press to publish his writings, the translation of the Bible into German, and his doctrine that faith alone was sufficient for salvation were crucial in making the Reformation successful.
Step-by-step explanation:
Martin Luther played a pivotal role in the success of the Reformation by leveraging several key strategies and tools. He was a prolific writer and utilized the printing press to disseminate his works widely, critiquing the Roman Catholic Church's practices such as the sale of indulgences. Luther's translation of the Bible into German was groundbreaking, allowing people to worship and understand scripture in their own language, a stark contrast to the traditional Latin used by the Church. His teaching that faith alone was needed for salvation challenged the Church's doctrine, creating a new approach to Christianity that resonated with the public and initiated widespread religious change.