I acquired that idea from the website Big C Catholics since the website has a same view I did of the Misfit and the reasoning behind his killing and why Flannery wrote her short story this way. .
Flannery O'Connor includes more than religious symbols into her stories. She includes many themes that relate back to religion in her literature pieces. However, there are not as many religious themes as there were religious symbols. Salvation and redemption have to be the main theme of this story due to the grandmother's sudden burst of religion at the very end of it. O'Connor makes a valid point in her writing that some people only find their salvation and redemption at the most unlikely of places and sometimes it can be too late to save them from their fate. The grandmother is the best example of this because all of a sudden at the very end she finally realizes that she about to meet her maker and she tries to talk to The Misfit about how God will lead him in the right direction and that he was a good man even though he might of not felt like it. The ironic thing about this theme is that at the beginning of the story her faith is never mentioned in fact she acts totally opposite but when it came around to her about to lose her life she started believing in the Lord. However, her actions in this situation are not out of the ordinary because anyone with basically a gun to their head would start trying to talk their way out of it as much as possible. Another theme that I found interesting is the morals that both the Grandmother and the Misfit have towards everyone. They both stand by their morals throughout the entire story; the grandmother has her hostile grandchildren but doesn't let them bring her down and the misfit has morals of being polite to others. Some say he isn't polite since he does kill multiple people but if we look back through the story there are several situations that shows he does have respect towards the grandmother.