The central confrontation between the grandmother and The Misfit in "A Good Man is Hard to Find" revolves around Jesus. The grandmother brings up praying to Jesus in the hope that she can induce The Misfit to spare her life by appealing to his religious sense. It turns out, however, that The Misfit has probably thought about Jesus more seriously than she has. The Misfit's doubt in Jesus leads him to think that there is no real right or wrong, and no ultimate point to life. At the story's climax, the grandmother appears to receive a moment of divine grace, which might transform her and The Misfit. How this ending is understood is the major question of the story.
The grandmother never took her religious faith seriously.
The grandmother's final gesture is a genuine moment of grace.