When Jen Hatmaker speaks to stadiums full of Christian women, she regales them with stories about her five children and her garden back in Austin, Tex. — and stays away from politics. But recently she took to Facebook and Instagram to blast Donald J. Trump as a “national disgrace,” and remind her legions of followers that there are other names on the ballot in November. “Trump has consistently normalized violence, sexual deviance, bigotry and hate speech,” she said in an email interview. “I wouldn’t accept this from my seventh-grade son, much less from a potential leader of the free world.”...