I think that the theme of redemption is essential to Dickens' work. In the final analysis, it is redemption that becomes the lasting legacy of Scrooge and his transformation. Through his redemption, his transgressions earlier in the narrative are forgotten. Instead, the reader is moved by the evolution in character Scrooge has undergone. This is only possible because of his redemption, the notion to redeem himself by making right that which he helped to make wrong.
It is this example of redemption that makes the work everlasting. The notion of "the Christmas Spirit" as well as the idea that the holidays can humanize anyone and everyone is where Scrooge's redemption is the most significant. The work's success in seeking to illuminate its themes starts with Scrooge's redemption. If he is not redeemed, the rest of the work falls apart. In Scrooge's redemption, the power of the work is revealed. When Belle tells Scrooge that he fears the world to an unhealthy degree, it is through Scrooge's redemption that he is able to overcome this. It is for this reason that the theme of redemption is significant in Dickens' work and through Scrooge, as a character.