The chilling murder cases of Brenda Wright Lafferty and her 15-month-old daughter that sent shock waves through the Utah Mormon community in the ’80s are the center of the true-crime thriller series “Under the Banner of Heaven.” The seven-part FX miniseries, which is based on the eponymous 2003 nonfiction bestseller by Jon Krakauer, stars Andrew Garfield and Daisy Edgar-Jones in lead roles as it examines how deep-seated religious beliefs played an integral part in a tragic double murder….