LOTR is a Catholic book written for a secular audience. Without Catholicism, it could never have been written properly.
It’s why the books are a masterpiece, but nothing on film really is. Jackson’s LOTR came pretty close to how it could be done but I think he had a lot of scholastic help when writing his movies.
Secular minds cannot readily translate Catholic doctrine and rejecting Catholicism in favour of secularism is mostly why it is failing to translate properly.
Tolkien helped bring C.S. Lewis around to Christianity.
I think Jackson had a great appreciation of the toll WW1 took on LOTR. His production of “They Shall Not Grow Old” shows that. LOTR would not have been written without Tolkien’s experiences in that war.
There are those tht claim LOTR was written as a parable about a war between world communism and the damaged nations of western Europe.