I really need some help with my horror story

I hope this is the right place to post this. To put it quite frankly. I think I ruined my story a bit for myself. I have been researching zombie stuff all night. And my story just isn't the same. Mine is inspired by J-Horror. I know Zombie Z-Horror is rare. But I really got inspired for this story. Let me explain the plot.

There is a Japanese village. They had a prophecy that if the chosen one enters the cave(behind their shrine) at the base of a mountain near the village, the dead will rise. Of course, this place is off-limits. Now enter Kamijou Hedeki. He's a very logical teacher who tries to disprove this rumor by visiting the place. Of course, it starts a sort of zombie apocalypse. Now the story focuses on 6 people who are all major parts of the prophecy. My aim is to (try) to make a legitimately scary story... The zombies themselves vary. The old ones that have rotted are very slow and typical. While the newly "converted" zombies are quicker. But still not very fast. Their main focus is to turn everyone into zombies, to give their god power over them. So there isn't much flesh eating going on. :/ There is alot of death. I already have the whole story planned and have written 7000+ words. The question is, should I worry about this being too different from the norm?

I like the fact that you ditched the flesh-eating aspect of the zombie hoard concept, but there are still a few issues:

• The idea of the logical newcomer who inadvertently triggers some kind of supernatural catastrophe is a cliché at this point. Unless you have an idea for how to spin it in a really new and original way, or you know that the rest of your story will otherwise subvert or exceed expectations of such a tail, then please come up with something else.
• How much does this story need to be told in Japan? While Shinto as a religion provides an excellent framework for some serious supernatural weirdness, there are plenty of other spiritual traditions in this world that lend themselves nicely to the same purposes. West Africa, Finland and Canada are just a few examples that I can think of off the top of my head, but believe me, there are others. In any case, before you write this, you should make sure that you have researched the culture and traditions of the place that you are depicting very thoroughly. Anything less would deprive the setting of meaning.
• Zombies are fun, but they are only truly frightening when their motive is either impossible to ascertain or completely alien to that of the living. The quintessential example of the former would be Night Of The Living Dead. We never find out why the zombies do what they do or how precisely they do it, other than that you turn into one of them if they bite you. The latter, on the other hand, is perfectly encapsulated in Thomas Ligotti's vignette "Autumnal", which I am not going to spoil because you really should read it yourself. Anyway, the point is, zombies are a cipher. That is the key.

I see no huge fundamental problems here... except having this one guy be the chosen one seems like a bit of a coincidence. Maybe have the prophecy be more along the lines of 'don't do xyz in the cave behind the waterfall', or have something to do with respecting spirits or gods or whatever, instead.

Other than that, like all horror, all lies in the execution.

I don't really see how anything in that post is remotely different to the norm except for the fact it's in Japan, so I don't think you need to worry about that. If anything the problem is the opposite, there's already a lot of zombie stuff out there, so it could be challenging to stand out.

I don't think you need to ditch the 'logical newcomer' thing, but I think you should be careful because there's a high risk of it turning into an Idiot Ball thing that makes the character really annoying and unlikable, unless you really fill in his motivations and make him sympathetic.

Also what makes the chosen one the chosen one? Who is he chosen by, for what, and why?

I wouldn't worry about it being too different. I'd worry about it being too samey. Let's face it, zombie fiction is kind of saturated lately and while setting it in japan is a good way to show something different, try to make the zombies and characters distinctive to the culture and setting. So it becomes less of a zombie story set in japan then a Japanese zombie story.