Said the bible biggest religious authority not the pope.Luther taught that salvation and, subsequently, eternal life are not earned by good deeds but are received only as the free gift of God's grace through the believer's faith in Jesus Christ as redeemer from sin.
These are two of his main points. Their are more though.
Martin Luther disagreed with many things Catholic, but the main things were the purchasing of salvation or earning salvation by performing good works. He taught (which I believe as well) that salvation can not be earned at all, but only by the grace of Jesus Christ. "For by grace you have been saved, and that not of [good works], lest any man should boast". The other thing he disagreed with was that the popes did not have "divine right". I hope this helps! :)
