The connection is probably that they're all "epics" but yeah, it does stylistically surprise me too.
Tolkien though, knew how to create a very lovable but complex world. It's a lot to read though!
(or in my case, re-read)
Narnia? yes, the Christian overtones. Both Herbert and CS Lewis cater to more specific audiences than Tolkien I think.
In my perspective, Tolkien sort of carries the torch of writers like Dante, in a sense. But then, I'm surprised in this day and age of people who can only read brief sentences instead of paragraphs) that his series is still popular! A testament to his character writing then?