I know three people personally who were fired within a week for their boss finding out they were an atheist. Apparently South Carolina doesn't have the critical percentage of 'Nones' it takes to trigger equal protection for nonbelievers. If I didn't work for a large corporation, it could have happened to me...all I got was the worst survey of my life after it came out that I was an atheist at work, on the personal behavior stuff. Suddenly my staff rated me as 'unapproachable' and 'difficult to work with'. A year later it had blown over and my next survey was back to normal. One of my staff later shared with me the buzz going on about me being an atheist at the time they were doing the survey, and was willing to state the same to HR, which is the only reason I avoided disciplinary action for failing the survey.
I'm not anti-Christian. I'm anti-stupid.