A few vehicles dot the parking lot of New Hope Methodist Church in suburban Atlanta, but there’s no sound except the rumble of idling motors. Slow rain becomes a torrent, blowing in wide sheets, obscuring the pastor standing on the church steps as he delivers his sermon. Drivers flick their windshield wipers to life and stare straight ahead. They won’t leave their steel cocoons any time soon. They won’t need to: The sermon booms from their radios like Carrie Underwood.