Of course I can't be totally sure that my idea is right. However, I don't see anything blasphemous in it. Even though
Tolkien imagined that
Middle-Earth is the past of our world, I think he would agree that these worlds are rather different in some sense. For example, the first chapter of
The Silmarillion has a lot in common with The Bible
but not everything is similar there.
That's putting it mildly.
Apparently, many readers have compared "The Silmarillion", or at least its part(s) "
Ainulindalë" (and "
Valaquenta"?) to
the Old Testament, and specifically early parts of Genesis. All I can say to that is that those making the comparisons cannot have read at least one of the
books closely enough, perhaps even both. I'm thinking of JRRT's cutting comment in the foreword to the Second Edition: "Some who have read the book, or at any rate have reviewed it ..."
Yes, there were (and are!) people "in the public eye" who have gained a certain reputation there (by whatever means) who are not shy about spouting mental diarrhea about topics about which they know nothing (like not having read LoTR - and this is not the only book I know this about). With the Internet, this situation has gotten infinitely worse ...
I'm not getting into JRRT's comparisons of
Galadriel to aspects of the "virgin" Mary, or of
Gandalf or
Frodo to aspects of Jesus ...
But the "incarnation of
The One" is
THE central tenet of Christian belief, bar none. New Testament. The Christian denominations disagree on details (unfortunately raising the disagreements to points of dogma). JRRT as a devout, conservative Vaticanum I Catholic (he was unhappy with much of the Second Vatican Council), would not have touched an earlier incarnation of "The One" in his writings with a 100-foot, never mind 10-foot pole.
In that foreword to the Second Edition, JRRT also mentioned "applicability" residing in the freedom of the reader (contrasting it to "allegory" as the purposed domination of the author). What is "applicability"? Perspective, I would propose, background.
To swing wide, someone reading LoTR with a Confucian, Daoist, Hindu, or Buddhist background might find applicabilities (I hypothesize here) that would leave JRRT responding "oh, really?". Closer to home (leapfrogging the other two Abrahamic religions), Eastern Orthodox-, Lutheran-, Calvinist-derived applicabilities might have him scratching his head (while grumbling). Then all of the philosophies that are not considered religions ...
And last, applicabilities may stem simply from the lives all people have lived, their unique experiences (with or without adhering to any of the above-mentioned systems - though no one remains unaffected by the one dominant where they live). To this JRRT could have no answer.