Nadia Bolz-Weber is ordained in the Evangelical Lutheran Church in America (ELCA), a fast declining liberal Mainline Protestant denomination. Heavily tattooed and often obscene, she’s different from typical Mainline clerics. Formerly pastor of a small Denver church she founded, she’s a fairly popular writer and speaker. Wikipedia calls her a “public theologian.” Ostensibly her vulgarity makes her more authentic. Perhaps she was being authentic when she recently tweeted to her 93,000 followers a pic of her middle finger aimed at a metro Denver bakery, declaring: “My 12-step program is next door to Masterpiece Cake Shop (of anti-gay fame) so as...