system
Given the following post, respond as if you're commenting on Reddit:
human
[Vampires] will any holy symbol do, or is it only the cross that works?

Okay, I am currently in Riyadh and there is this vampire going around killing anyone he gets his hands on. Problem is that I didn't bring along my vampire hunting kit with me (something about airport security and "youre not allowed to bring guns on the plane", I don't remember, I was kind of zoned out.) Now, seeing as I am in Saudi Arabia, and the chance of me finding a church here is nil, I need other options. Will the Crescent moon of Islam protect me against a vampire, or must it be a cross?
gpt
I am going to break with the consensus here, and say that anything will work, but that you don't have to believe in it. The *vampire* has to believe in it. 

Assuming the vampires in Riyadh aren't those bullshit "virus" guys with all kinds of odd science based weaknesses, the core essence of a vampire's being is selfishness and self-exaltation.  

Hence their common reaction to the icons of faiths.  Even the most corrupt place of worship is ultimately and always about something greater than the self, about ideas of sanctity or charity or service or glory that are so antithetical to the existence of a vampire that the magics that drive them are simply incompatible with their presence.

Think of it as the moral equivalent of scattering 100,000 grains of sand in front of the fiend.

It's not the weak or strong faith of the wielder or even the particular beliefs behind the symbol that keep vampires at bay. It's that their mind simply boggles at the idea of true faith.