If you want to see what happens when the writers lose their nerve and try to explain everything, watch Lost.
There really needs to be an "engineer plot" genre where plot stays consistent to a small set of made up axioms. "The Strain" made an attempt. It boggles the mind why not in a single one of the zombie stories out there nobody bothered to wonder where the zombies get the energy? The way most of them work it's like cold fusion landing in one's lap.
There is quite some overlap with fan fiction, because people like to "fix" non-rational fiction. Eliezer Yudkowsky and his take on Harry Potter is the prime example. I can also recommend Alexander Wales who also made original fiction.
Probably the oldest related work is A Connecticut Yankee in King Arthur's Court by Mark Twain.
Another name mentioned often in this genre is Brandon Sanderson and especially his Mistborn series, but I have not read it personally.
Text: https://www.fanfiction.net/s/10360716/1/The-Metropolitan-Man
Free audiobook: http://www.hpmorpodcast.com/?page_id=1705
You will enjoy the book "The Girl With All The Gifts"
Spoilers in link: https://en.m.wikipedia.org/wiki/The_Girl_with_All_the_Gifts
Zombies, like vampires in the pre-industrial age, are meant to represent the horrors that lurk beyond the limits of human understanding and control. Although I'm sure some author has attempted to "harden" zombies like that, to me the more you try to explain them, the less effective they are as monsters. Because they don't work rationally, they're demons of the Id.
(Also: Leslie Nielsen's first starring role).
From brains. Duh. ;)
Zombies are like that. They gorge on fatty foods, like brains, bone marrow, and body fat, then go into an induced stasis that outwardly resembles death.
The zombinism vector is undoubtedly an endoparasitic fungus related to Cordyceps. Mycelium spreads throughout the host during the infection, preferentially following existing neural pathways, and flooding the body with antibiotics, to kill native gut bacteria and other possible putrefying factors. The normal digestive functions are destroyed. The regular circulatory system is destroyed. The only elements preserved are sensory organs, muscles, skin, and bones. All other functions are replaced by the fungus. The mycelium, as it followed the existing neurons, actually grows into a replacement brain and nervous system as it destroys the host's nervous system.
The copy isn't perfect, though, and genetically hardcoded structures produce an instinctual desire to seek out and eat more fat. Destroying the head does not actually kill the fungus, but it does remove its ability to create a facsimile of a mammalian brain, by scrambling the template. It could still make the muscles twitch, but would have no means of coordinating them into coherent movements.
I would therefore expect a zombie running low on energy to have almost no fat left, and ascocarps growing out of it all over, like cactus spines. It would probably resemble a spiky mummy. Any rotting appearance would be due to colonies of microorganisms that have evolved resistance to the fungal antibiotics.
So it's not just eating brains, but also not spending as much energy as a human normally does while using the organs evolved to keep a human brain alive.
Which is exactly what I concluded.
Midichlorians
This guy did a movie where a Jew kills Hitler. He has shown he has no interest in the question of "What really happened." Re-writing a small bit of the Bible is trivial compared to re-writing the most important event of the 20th Century. His focus is on being interesting and entertaining and he clearly feels that it is fine to put distance between himself and reality to achieve his goals.
The quote comes from a film 20 years earlier, Karate Kiba, not from the OT (despite the attribution in PF).
https://en.wikipedia.org/wiki/Karate_Kiba#Cultural_reference...
The Ezekiel "quote" always bugged me because even without looking it up, anyone who spent any amount of time in the Old Testament, could tell that it was fabricated. "Finder of lost children" is not an OT motif in general, and certainly not in Ezekiel. Obviously, Tarantino knew people would look it up and go "what the heck is this?" Therefore I have to think it was an intentional move on his part, but why?
I think it's a tell that there's a story-under-the-story in Pulp Fiction which lends credence to the other observations. There's obviously something supernatural going on. One of the things I love about the film is that Tarantino doesn't explain anything. He lets mystery stay mystery, as any good story should.
I don't buy the Silmarillion connection. Nor do I think that this movie is a loose retelling of any specific classical tale, ala O Brother Where Art Thou. It's more likely that he doesn't have any specific story in mind, but sprinkled the supernatural element into PF to give it an air of mystery. But I'd love to be proven wrong.