I would think that a balrog really wouldn't be likened unto Satan. Melkor would be a better analogy, would it not?
I believe Hookbill covered the others fairly well, but there are a lot of people who would be considered as sages in literature and Elrond does not strike me as a Christ figure.
Having a hero return to life after 'death' is quite common also in fiction, especially fantasy. It doesn't seem too unique to Tolkien.
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“I wish it need not have happened in my time," said Frodo.
"So do I," said Gandalf, "and so do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given us.”
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