The first thing to know about The Gospel According to Heather: It’s way out of author Paul Gordon’s wheelhouse. Gordon, the rare writer who creates book, music, and lyrics, specializes in adaptations of lofty classics, most prominently Jane Eyre. His  2009 version of Daddy Long Legs gets produced a lot (while convincing some of us that epistolary musicals aren’t a great idea). For The Gospel According to Heather he turns thoroughly contemporary, with an original story so current that there are jokes about drag storybook hour, Dylan Mulvaney’s Budweiser ad, and the congressional tussle over gas ovens. Heather, like its title character, isn’t perfect, but it has more on its mind than the average musical comedy, and it dispenses its outrage with verve and good humor.