Christian man sues employer for forcing him to see a Pride flag on his way into work
(www.lgbtqnation.com)
So yes, but also this is slightly different than that. It's about the department itself flying the flag. Still absolutely insane, but slightly less insane than that. The end result, if this person wins, is literally no flags or any other messaging. "My religion doesn't support nationalism." This would also include extreme stances like "my religion doesn't support the periodic table" or things like that.