Actually, there is a lot christian about the books. I have read them a couple of times also and currently have them in audio books. J.R.R. Tolkein actually led C. S. Lewis to Christ, they were great friends and members of the same christian mens organization. The Chronicles of Narnia series are more evident in the Christian themes. You actually have innocent Aslan(the Lion[of Judah] to die for Peter's offense, and then is resurrected. LOTR series the theme is a bit more sutble but there, and you almost have to read the appendixes and subsequent books(The Simarillion, it has the actual story of the Creation of Middle Earth, etc.) to really see the Christian themes. But I really don't think it is that difficult to see the theme running through it....it is more on the level of the Great Cotnroversy with battles between good and evil for Middle Earth, etc.
I also find most who criticize the LOTR have never read them or seen the movies beyond the fact that there were wizards involved.......LOL!!! I wouuld tell you of another well known sci-fi/fantsy series that has strong christian themes, but I don't really want to be responsible for Reddogs needing a visit from the paramedics on Resurrection weekend and all.......LOL!!!