Correct me if I'm wrong, but is this Joseph Campbell's description of hero's journey and how it leads to more introspection and a spiritual rebirth of the hero?

Frodo I think fits more of the Christ figure. One is that he's not human, and it's pretty much explicity stated that no human could ever do what Frodo did. He does not choose to go on this journey or be a hero...it's thrust upon him, just as Christ's task was thrust upon him. I think the biggest reason Frodo doesn't fit campbell's hero description is because Frodo never really comes back. He gives up his happy life for the betterment of those around him and leaves forever, just like Christ did. Campbell pretty much requires that the hero goes into the abyss and comes back as a changed person. I would say Sam might be a hero, and Aragorn too, but Frodo I don't think is.