Gentiles = non Jews.
In the OT, the Jews think that anyone who is not Jew is unclean,
because they're the only selected holy people of God and everyone
else is called a Gentile...(like unclean citizen).
So technically, most of us here are Gentiles, unless you got
Hebrew blood....
the term gentiles sometimes is used to (wrongly) illustrate
Christians and non-Christians, its technically incorrect, because
we're all Gentiles and being saved doesn't make you a Jew, even if
you can speak Hebrew or live in Israel !
The author behind LOTR is trying to portray a bible message and
story behind the story...I'm not guessing, its openly known, you
can read the interviews etc. but to use a movie to predict the
coming of Christ etc. is very far fetched and hmm...illogical.