Scout told the whole story as the narrator.
Scout has an innate sense of equality and goodness. Her sense of innocence is combined with a scrappy sense of social justice that, in her way, reflects her father's sense of social justice. Scout is also a relatable character for the reader. Her childhood and nostalgic narrative of her past is witty and relatable. It is also important to note that Scout narrates her story as an adult. She is able to look back on her experience with the hindsight that maturity brings. I this sense we enjoy not only her childlike innocence but also a point of view that comes with the maturity and sober reflection. A different narrator would have significantly altered the mood and tone of the story.
Tom either did not no or care that his own father had sold his soul to the Devil. Even when he finds out, Tom still decides to sell his own soul. After selling his soul to the Devil, Tom decides to become a judgmental religious zealot who persecutes people who believe in God as being "hypocritical". He reads a big Bible to shoe people how devout he is. While acting pious, Tom lends money and makes interest, a traditionally "unchristian practice" on the backs of poor people.
