This:
2. The doctrine of justification. Lutherans believe that a person is saved by God's grace alone through faith alone in Christ alone. The Roman Catholic Church, while at times using similar language, still officially holds that faith, in order to save, must be accompanied by (or "infused with") some "work" or "love" active within a Christian.
reminds me of, what else, a joke (soon I'll run out of denominations to offend).
A man dies and meets St. Peter at the pearly gates. Peter is giving the man a tour of heaven. As they approach a group of people huddled together, Peter tells the man to tip-toe and be very quiet.
"Why?", the man asks.
Peter says, "They're Church of Christ - they think they're the only ones here..."
When I learned that one, it was the Catholics who thought they were 'the only ones here.' That was years ago.