What is Maudie and Scout’s discussion about different kinds of Baptists?

In Chapter Five, Scout asks Miss Maudie about Boo Radley, and Miss Maudie tells her that he's still alive, he just doesn't like to come outside. She also says that most of the rumors about him aren't true and explains that the Radleys are foot-washing Baptists - they believe all pleasure is a sin against God, and stay inside most of the time reading the Bible.