Navtej Johar’s new play Tanashah, which opens in Hyderabad this weekend, is based on the diaries of Bhagat Singh. Discussing why the play hinges around Singh’s essay, Why I am an atheist, which he wrote in prison in Lahore shortly before he was hanged., 63-year-old Navtej says over an email, “I am uncomfortable with the popular notions of religiosity and …