Okay. I've also seen that there are Christian witches too, so I was wondering if the following concept would work:
The character is Christian, but isn't overly concerned with denominational details or typical prayers and worship. When dealing with supernatural creatures or people using harmful magic he can channel the power of his faith to directly repel them and make himself stronger. He can also heal people, including himself, giving him the ability to survive fairly severe injuries.
He also has a sword which he's skilled in using that is also a holy symbol for him.
It's an interesting character concept, but it doesn't really fit the 'Verse we're playing.
As Aiden said, a sword would just be weird, even in Vegas, especially when a lot of modern weapons are far more effective against the majority of supernatural beasties you could come up against. Gun are amazingly effective as long as you've got the right rounds for them!
With the powers they just don't really fit. Anyone can carry an object of their faith (cross, Torah, image of Buddha etc.) and have it glow/burn to protect them from vampires/demons. They can also use their scripture to help repel demons so long as it's backed by faith. An atheist with a cross, or quoting scripture is just lunch. Also, someone of faith using the wrong
symbol (ex. a Buddhist with a cross) is lunch too. Faith doesn't make anyone stronger, but it can certainly give them time to reload as it keeps the monsters at bay.
I've never seen healing be a thing in this 'Verse either. Lots of your supernatural beasties heal themselves
quickly, but even that has it's limits. They don't get to heal anyone else though.
If you want to make a vampire/monster hunter that's totally doable, there are plenty of them in this 'Verse but most of them are really just normal humans that are good with guns. The majority fall into one of three categories, ex-military, animators, or people with an axe to grind. Some of the ex-military end up in RPIT squads as well (police squads specifically dedicated to solving crimes committed by preternatural means) and tend to like the rush of hunting something that is, technically speaking, higher up the food chain than they are. Animators are zombie raisers and can usually sense the undead which helps them find vampires; they also tend to have a partial immunity to being rolled by vampires but it's not complete and works best against young vamps, an old Master Vamp, is taking just about anyone's mind if they want to! Folks with a grudge are the most likely hunters to end up dead quickly because they let their need for vengeance make them stupid. If they don't end up dead though, they make pretty decent vampire hunters in the long run.