A religious context frames the entire Narrative. The abolitionists were, for the most part, religious people, and many of their arguments were based on what should be the conduct of Christians. Abolitionists, Douglass included, wanted to distinguish their kind of Christianity from that of the slave owners. Abolitionism was clearly a part of their holy crusade.
Douglass ends his autobiography by reaffirming his name/identity ("I subscribe myself, Frederick Douglass"). Because slaves have no identity, by recognizing himself, Douglass is finally free.
