Ladymage, Welcome!
Redemptive Themes: Religious Imagery in Tolkien.
Well, that is not a light subject at all.
Galadriel is not a character that I've considered in this light before. If you could share your thoughts I'd appreciate it.
For me, I find three types of Christ in The Lord of the Rings... Prophet, Priest, and King. These are represented by Gandalf, Aragorn and Frodo. Gandalf brings hope to the dejected. He brings light to those in the dark. He encourages those who want to quit. For me, Gandalf fulfills the Messianic role of Prophet. He brings the good word. He brings hope. He brings light and encouragement. He reminds the people of what is right and he strengthens their morale to then do what is right.
Frodo represents the second of Jesus' roles, the Priest. A priest serves as an intermediary between man and God. In the Old Testament, the chief function of the priest was to make sure the sacrifices for sins and the offerings to God were done properly. The priest was the one who helped the people be in a correct relationship with God. Frodo accomplished this by volunteering to take the Ring (sin) from the Shire (this saved the Hobbits). Later Frodo volunteered to take the Ring to Mount Doom (and save all of the Free Peoples of Middle-earth). Of course, Frodo did not make it and the analogy breaks down.
But Frodo, by taking the burden of the Ring upon himself and enduring the evil blade of the Nazgul, the venom of Shelob and the teeth of Gollum became what the prophet Isaiah called the "suffering servant." He was a young, an innocent and good hobbit who undertook the quest to destroy the embodiment of evil... and he suffered for it. He saved the world (with help)... be he was not able to enjoy it. The hobbits gave their praise to Merry, Pippin, and Sam. They sort of put up with Frodo.
The most obvious of the three is Aragorn. The title of the third book, The Return of the King, says it all. Society in Middle-earth had broken down by the time of Aragorn. Orcs, Trolls, brigands, and wargs wandered the world. Even in Gondor (bastion of culture and order), they were ruled by a man in the throes of great depression. Gondor was beset by enemies. Aragorn defeated their enemies in battle and gave peace to the kingdom. Aragorn healed the gravely sick. (He called himself the Renewer, Envinyatar.) He dispensed justice to Beregond, Faramir, and many others. He showed mercy to those who sought it. Without a King of Gondor, Middle-earth withered. With a restored King, Gondor drove the orcs and trolls from Ithilien and Mordor. With a restored King of Gondor, the Haradrim and the Easterlings were driven back and then made vassals. With a restored King of Gondor, the Kingdom of Arnor was renewed. In short, justice and peace were established. This is what we are promised with the return of Christ.
Yes, all three analogies break down at some point. Gandalf was an angel, not a man. Frodo was unable to let go of the Ring of his own accord. Aragorn's peace and justice did not encompass all of Middle-earth.
I feel these themes were definitely intended by Tolkien though the imagery is not always overt. Obvious examples include Ioreth's comments in the Houses of Healing, "The hands of a king are the hands of a healer"; Gandalf's return from the dead; Aragorn's journey along the Paths of the Dead (he traveled to the underworld of Ghosts and emerged as their king, i.e. he figuratively died and came back); Boromir's and Denethor's doubt that anyone noble could come from Arnor...