I never thought I'd be comparing J.R.R. Tolkien's legendary fantasy book with a previous (and obvious) Christian fantasy story, John Bunyon's Pilgrim's Progress, but that's basically what I came away with as an overall impression, that Frodo's quest to destroy the One Ring would become both an internal and external struggle of the soul for the main character to remain steadfast in his journey, all the while war wages across Middle-earth among the various races. I can see why Frodo would be considered a Christ figure in this story, as he struggles to rid the land of the overbearing evil contained in the One Ring and only he could accomplish this task...which he fails near the end, though circumstances (and quite possibly a higher power) would take the Ring to its final destruction.
A modern day Pilgrim's Progress
I never thought I'd be comparing J.R.R. Tolkien's legendary fantasy book with a previous (and obvious) Christian fantasy story, John Bunyon's Pilgrim's Progress, but that's basically what I came away with as an overall impression, that Frodo's quest to destroy the One Ring would become both an internal and external struggle of the soul for the main character to remain steadfast in his journey, all the while war wages across Middle-earth among the various races. I can see why Frodo would be considered a Christ figure in this story, as he struggles to rid the land of the overbearing evil contained in the One Ring and only he could accomplish this task...which he fails near the end, though circumstances (and quite possibly a higher power) would take the Ring to its final destruction.