I started reading these books back when they first started releasing the collections. It's a korean comic and has some neat art, which is sorta what the animated intro sequence is trying to look like a bit, but only barely. The art in the book is mostly straight lines. hardly any curves.

Further, I don't remember the books being much like this at all. I've not read them in years, but what I remember:

The books do not deal with vampires as much as demons and zombie-like guys. The vampire queen in the movie is actually a demon. The story opens with Urban's character walking into a town that's been overrun by demons and killing them all. He's actually kindof a good guy in the book... I don't remember much church stuff going on...

I dunno, now that I've seen the movie, I'm not sure if my recollection of the books is correct or not, and now I kinda wanna read some of them again. I don't remember it being a particularly good series, tho. After the second or third book it becomes kinda hard to follow, with flashbacks and stuff going on. I think they greatly changed much of the plot, aside from the kidnapped girl.

But they did change the tattoos. In the book they are much smaller. Just two lines forming a cross, and it didn't go down into their nose like that. Proof:

And they don't do all the goofy ninja kung-fu fighting bullshit in the book, either. They mostly shoot people in the face with shotguns. And they ride horses in the book. Actually, there's not much in the way of sci-fi in the book at all that I can recall. So yeah, the movie isn't based on the books as much as it just borrows some ideas and characters and a very very basic plot idea from the book and then goes off and does it's own thing.

But like I said, it's been several years since I've even touched the books, and my memory of them is really spotty. I've got them somewhere, so I'll look through the first several volumes again to make sure I'm not misremembering anything.