As a Baptist, my faith doesn't rise or fall because of Martin Luther or John Calvin. Both men are just fallible guides. However, I'd like to add an interesting twist to things. It's often said Luther added "alone" to Romans 3:28, which by the way, doesn't need the word alone either! Instead, we need to look into the glaring truth of the details.
The Good News Translation renders Romans 3:28 in this way:
For we conclude that a person is put right with God only through faith, and not by doing what the Law commands.
In fact, this verse is even easier to understand than most Protestant-approved translations. Even stranger, even the New Catholic Bible says it this way:
For we maintain that one is justified by faith apart from the works of the Law.
What part of only through faith and apart from the works of the Law can't Roman Catholics understand? The more I think about it, the real problem isn the spiritual deadness of man. 1 Corinthians 1:21 says that the world never knew the world through human wisdom. 1 Corinthians 2:14 says that the natural person finds God's Word foolish.
The reality of the situation is, Luther didn't need to add the word alone.