Who knew that you could give arthouse horror a kick in the pants by substituting ominous Christian iconography for ominous Jewish iconography? Crosses, crucifixes, crowns of thorns, tormented priests and the like have been staples of the horror genre as far back as the beginning of cinema, if not, at least, Mario Bava’s “Black Sunday” and “The Exorcist,” and have remained in vogue in the form of everything from the uber-popular “Conjuring” franchise to the recent, terrific “Saint Maud.”