Not saying that it means anything, but the Fever books are centered on Celtic folklore, and most mythology and folklore from one culture to the next resemble each other in some ways. For example, in Norse mythology the first humans were Ask and Embla, which is a little bit eerily similar to Adam and Eve in Christian scripture. Also, the Seelie and Unseelie in the fever series resemble the Light and Dark elves of Norse Mythology (if you are into LOTR think legolas as a Light Elf and the orcs as the Dark Elves)
Two story elements always get the geek in me all excited: foreshadowing and allusion. I LOVE them. Seriously, it gets creepy how giddy I get when I stumble across it. lol.
The fever books have a looooooooooooooooot of Christian Allusion, I am however, not a constant church goer. I go once in a blue moon, but I can't seem to sit still long enough to make it through the service. That being said, I am way outdated with my knowledge of Biblical storys and what not, but I know enough to recognize it.
1. the spear of destiny. This was used to pierce the side of Christ, and now it is one of the few weapons that can save mankind...interesting.
2. The Four Horsemen of the Apocalypse: Death, War, Pestilence, and Famine. They were just released on Dublin, and Dublin is now de-populated. dun dun dunnnnn.
3. The BEAST! the Sinsar Dubh has taken on one of the many names of Lucifer. That is incredibly interesting to me.
4. The Royal Hunters have the appearance of the popular depiction of the devil. I find this intriguing as well.
5. Mac cried tears of blood. I am not exactly sure what this is alluding to. I remember some debated about a Virgin Mary statue that had blood tears some time ago, but if it is in regards to something biblical I am not sure. I thought it was GREAT imagery for the scene. but...yeah
feel free to add to this I just wanted to toss it out there since it was in my head hehehe