Yeah he ran up against this:
James 1:22-25 (KJV)
But be ye doers of the word, and not hearers only, deceiving your own selves. For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass: For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was. But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.
It's amazing to me that the accusation against Protestants is repeated again and again after hundreds of years. Faith as the FOUNDATION for works, not mingled with works, is what Luther and orthodox Protestants have always taught.
Think about it historically--are the historically Protestant people-groups somehow more libertine than Roman Catholic? The USA has historically had a majority of Protestants--are we somehow less moral in our lifestyle than say France, or Italy? As James is saying, REAL faith always brings works along with it...but the foundation and starting place for good works is faith alone in Christ' works alone.