Though King Lear is set in a pre-christian pagan era there are many allusions to Christianity found within the Play. The biggest example of this is Cordelia.

Throughout the play there are several allusions to her being a Christlike figure. In Act 4 scene 3, when Cordelia makes her reappearance, she described in reverent/biblical terms such as: "she shook...The holy water from her heavenly eyes”(28-29). Cordelia's character is motivated by love in all she does which is similar to Christ love. Cordelia has several christ like traits such as forgiveness, purity, and, love. Even though her father at the beginning of the play turned her out, Cordelia forgives him and brings and army to help her Lear. In scene four Cordelia says "O dear father,.. It is thy business that I go about” which is similar to Luke 2:49 where Christ says, "I must go about my father’s business”. In Act 5 when Lear and his daughter are reunited he kind of shy's or hides from out of shame for his mistakes but Cordelia welcomes him with open arms this reminds me of Christ's role in repentance. When we sin or make mistakes often we find our selves avoiding repentance out of shame for our actions but no matter what we do Christ is ready and waiting to forgive and help us. Cordelia is killed and essentially martyred at the end of the play similar to Christ's martyrdom in Jerusalem.    Because of these specific references to Christ I think Cordelia's character is meant to symbolize the Savior as opposed to just christian ideals. 

Because I interpreted the play this way I kind of attributed Edmunds character to satan, Christ's counter part. 

Edmunds motivated by hate for societies rules, his father, and his brother. But the underlying motive is jealousy. In an Lds perspective Satan wants to bring us down to his level out of jealousy because he can't rise to ours. In a general christian view Satan is evil. Edmund deceives his father and turns him against his brother Edgar. He deceives Goneril and Regan making them think he's strengthening their power while turning them against each other by stringing them along. In the end his actions lead to both Goneril and Regans death (I think in this case death could be symbolic of damnation). Satan's purpose is to deceive and tempt and Edmund does all these things with purposeful malice which is why I think he represents the devil.