Like an Onion
The Internet Monk has a powerful article about legalism in the Baptist tradition. Now I have never been Baptist but the brand of Mennonitism that I grew up in had some of the same traits while lacking others (especially when it comes to patriotism and supporting war). My spiritual life has been a journey of pealing peeling away the layers of legalism that I grew up with.
Take time to read through the comments because there is a lot of good stuff there, too.