**_Atmospheric but ambiguous tale of the birth of the antichrist_** A newlywed woman on the Isle of Man (Laura Harris) becomes increasingly suspicious when her son reveals coldhearted-ness while her friend and boss (Alice Krige) seems to be taking her place. Then there’s the mysterious taxi driver (Francis Magee). What’s going on? "The Calling” (2000) is a well-made supernatural thriller with the same plot as the contemporaneous “Bless the Child,” but is way more low-key. It mixes the set-up of “Rosemary’s Baby” with the spooky tone and muddled storytelling of “Nomads,” along with bits of…