What is the main conflict in Luther by John Osborne?

As he did in earlier works, such as his groundbreaking Look Back in Anger, Osborne profiles an individual in conflict with authority, which in Martin Luther's case is the vast authority of the Roman Catholic Church. In posting his 95 theses, Luther risked inevitable excommunication and brought the wrath of the highest church leaders, including Pope Leo X, upon him. He did this despite his uncertainty about what would come next, for, as he tells Cajetan at the Diet of Worms (a city in Germany) about the Roman Catholic Church, "A withered arm is best amputated, an infected place is best scoured out, and so you pray for healthy tissue and something sturdy and clean that was crumbling and full of filth." Osborne dramatically depicts how Martin Luther followed his convictions in the face of great doubts, and so transformed Christianity forever.