I was reading a thread where people were debating redemption arcs for characters in media and someone said that "Christians stole the concept of redemption and ruined it" by making it so broad. This confused me and I've been thinking over it. I've tried Googling keywords that might get me more info but it's not really led anywhere. I thought the popularization of the idea came from Christianity. Is there some prior use of the concept in Western Civ that I'm unaware of which was "stolen"? If so, what was it? If not, when do current ideas of redemption (a change of heart and lifting of guilt/sin) really get popularized within the West?