Final answer:
In 'To Kill a Mockingbird,' the quote about foot-washers thinking women are a sin is spoken by Miss Maudie, highlighting the theme of social prejudice.
Step-by-step explanation:
In To Kill a Mockingbird, the character who said, "Foot-washers think women are a sin by definition," was Miss Maudie. This quote touches on the theme of the novel that challenges social norms and addresses issues of prejudice and discrimination. Miss Maudie is speaking to Scout, explaining the extreme beliefs of some of the more fanatical members of their community who strictly adhere to certain religious principles, often leading to intolerance and bigotry. it is important to be cautious about attributing quotes to literary works that are not actually part of them.