That's the thing. It's all so ambiguous. I disagree Eru can be found in these things but I aint going to fight over it unless you want me to.
I think it's testament to Tolkien's skill as a writer that he simply cannot be pinned down to one meaning or interpretation. Just imagine how dull his work would be if he'd said "Alright, it's a Christian/WWII/English allegory*. Get used to it reader!" Why! He'd be like Lewis! Now I know a lot of you like Lewis (I'm not that keen, his life story is far more interesting, though Aslan is cute) but let's be honest, he's not got quite the fan cult that Tolkien has, has he?
*delete as appropriate.
Tolkien took the concept of the melting pot of the mind to its ultimate degree, and melded so many things into his work. That's why we argue so much about it. Let's not stop!