sentences:  The concept has been popularly associated with the religion of voodoo, but it plays no part in that faith's formal practices.How the creatures in contemporary zombie films came to be called "zombies" is not fully clear.The film "Night of the Living Dead" made no spoken reference to its undead antagonists as "zombies", describing them instead as "ghouls" (though ghouls, which derive from Arabic folklore, are demons, not undead).