Does Granny Weatherall have a sound religious understanding of her spiritual condition in "The Jilting of Granny Weatherall"?
On the whole, no. She has neither a religious nor a spiritual understanding of her situation. Look at the final lines of the story, where she says, " Oh, no, there’s nothing more cruel than this – I’ll never forgive it."
There is a place for anger and even despair at some points in the spiritual journey (and in some religious framework). However, there is no good place in any major tradition for a refusal to accept, a refusal to forgive, and a judgment of life and death as cruel. She simply hasn't grown as she'd need to do to make a religious/spiritual peace.
No, she doesn't. She feels jilted by God right up until the end of the story when she dies and the symbolic light goes out. She is still angry that once again, in death, she is jilted. She still holds too much bitterness and resentment from being left at the altar and still blames God, in many ways, for what happened to her. She's never gotten over that.