The Question and Answer section for Black Boy is a great resource to ask questions, find answers, and discuss the novel.
A strict Seventh Day Adventist, Granny is strict and religiously moralistic when she raises Richard and his brother during periods when Ells is too ill to take care of the boys herself. She has no faith in Richard's abilities, and instead...
Richard's actions in setting the fire were mere mischieviousness. He set the fire without thinking, and as a result, burned down half of his grandmother's home.
Grandmother was Christian.