Not so fast and not so simple:
Check out this explanation:
http://www.catholicculture.org/culture/library/view.cfm?id=1464&CFID=669278&CFTOKEN=88969182
Our Pastor gave a wonderful homily this morning on this subject. In it, he referenced the Joint Declaration between the Lutheran and Catholic Churches.
I'd always considered 'good works' part of the faith life of Catholics, simply because of what Jesus taught us about how we should treat others who are less fortunate, and meet their needs, in His name.