There was a Mel Brooks film with a Jewish Vampire in it (can't remember the name...) and a scene where you have the typical cliche of the woman in a nightdress in bed with the Vampire approaching, she wakes up and brandishes a crucifix at him to which he responds in a very stereotypical Jewish voice 'Sorry, wrong vampire'. That scene has stuck in my mind for decades despite forgetting everything else about the film including the title (and I am not even sure it was Mel Brooks... but he was the only person I am aware of doing Jewish jokes in Hollywood at the time).
And yes, George in Being Human is Jewish and has a Star of David which repels vampires... Most things I have read on the topic consider it the faith of the person being attacked rather than the faith of the vampire which repels. In fact, in Dr Who 'The Curse of Fenric' the Haemovores are repelled by faith in anything (the Doctor has faith in himself, Ace has faith in the Doctor which is later destroyed, the local vicar doesn't have faith in god which is why he gets eaten...).
Though I beleive that in the original vampire story, Dracula, he is repelled by crosses only because they represent the church he disavowed upon becoming a vampire. I have always been amused at how many Vampire writer ever since seems to have taken this feature and wrote it into thier own creations (though some do so to deny it is true...)