Why did Martin Luther split from the Catholic Church?

Related questions

1. Why was Martin Luther King assassination important?
2. Who was MLK's best friend?
3. What does assassination by firearm mean?
4. When and how did Martin Luther King die?
5. Why Martin Luther King was killed?
6. What happened after MLK assassination?
7. What religion was Martin Luther?
8. Why Luther left the Catholic Church?
9. What part of body was MLK shot?
10. Who was on the balcony with King when he was shot?

Tags

1. #authority
2. #papal
3. #questioning
4. #catholic
5. #theses
6. #luther
7. #reformation
8. #excommunication
9. #indulgences
10. #start
11. #pinned
12. #german
13. #pardons
14. #church
15. #protestant
16. #martin
17. #denouncing