To elaborate on ideas already suggested, Miss Maudie, in Chapter 22 of To Kill a Mockingbird, speaks, not about those who purport to be Christians, but about those who are truly Christian. For, one of Harper Lee's motifs is the hypocrisy of "the footwashers" and the other holier-than-thou's.
After the trial when Jem remarks,
It's all right to talk like that--can't any Christian judges an' lawyers make up for heathen juries
Miss Maudie replies,
That's something you'll have to take up with your father.
Miss Maudie refrains from commenting because she has faith in humanity. Just as Judge Taylor displayed his Christianity by hiring Atticus as the defender of Tom Robinson, and just as Heck Tate showed fortitude in giving objective testimony, there may appear a juror who breaks from the conventional wisdom of the others. After all, Mr. Cunningham held up the verdict for a while with his doubt. Miss Maudie believes in the heroic struggle, which is always the struggle of a true Christian.