IT'S THE LAW! Nobody is denying Kelvin Cochran his free speech; he's paying the price for his ill-considered actions

City of Atlanta's anti-discrimination law. 

All City of Atlanta non-discrimination laws prohibit discrimination based upon sexual orientation and gender identity, as well as race, color, creed, religion, sex, marital status, parental status, familial status, national origin, age and disability. The non-discrimination laws are set forth in Atlanta’s Charter and Code of Ordinance.

Religious Bias Issues Debated After Atlanta Mayor’s Dismissal of Fire Chief. (The New York Times, 1/11/2015)

Fired Atlanta Fire Chief Kelvin Cochran asks for a new sense of "ironic".