Science is inherently atheistic

[T0 Th3 M4X]

Mentioning a supposed "creature" doesn't mean I believe it exists.  I assume they don't exist, but maybe they do.  We don't use the scientific method to make claims about vampires, goblins, and ghouls. 

You might not, I would.  That's neither here nor there..though...it's that ghosts and vampires would be conceptual equals under the description you gave, wouldn't they be?  

The counter argument was that I must apply this equally to gravity because it may have a supernatural cause. 

It might.  I mean...it's putatively immaterial, ever present, ties all things together, and starts with a g...wouldn't it be fucking hilarious if gravity were the supernatural sauce in the universe?  

My argument to that is "it doesn't matter" because you can't negate gravity when the effect of it is easily testable, observable, and repeatable in the natural world. It's also applied as a scientific law in the form of Newton's Law of Universal Gravitation.  Unless Newton had law about vampires too, then no point making assumptions about testing them.  Even if they do exist, they would be considered supernatural and not bound by natural/universal laws.  Things like turning into bats, walking through walls, no reflection, and other such attributes would also be considered "supernatural."

Why wouldn't ghostly or vampiric effects be testable, observable, and repeatable in the natural world?  They might be considered things with a supernatural cause..but watching some eurotrash asshole turn into a bat would be a mighty compelling effect of whatever his supernatural sauce was.  

And from that, it was determined I was being a big meanie who must lie about everything, and the other person proclaimed a "win" by default.

More like that you're a simpleton, I think..but you can always win back hearts and minds round this joint!

So yeah, there ya have it.

But hey, if the prize is a pet vampire monster, I say "No thanks."

Regaining your dignity and/or credibility? 

I'm not going to tell someone what they want to hear just because they think I should. I also have no problem with someone wanting to believe in vampires.  That's their choice. Luckily, there are things like Facebook for people who want to join groups of "like-minded" individuals who will tell them exactly what they want to hear.  I'm sure there are vampire groups, and that they have thousands of "legit" photos they would love to show anybody joining their group.