Two stars. Rated PG. 86 minutes. An animated fable about the first Christmas, “The Star” reimagines the Nativity story from the perspective of an animal – actually, an entire menagerie of comical Holy Land critters, led by a miniature donkey, who become key supporting players in the tale. Among the production companies involved in making “The Star” are the faith-based Walden Media and Sony’s religious wing, Affirm Films.