It does seem like JPL is crossing a line here, on the face of the description.
OTOH, you don't know how aggressive this guy might have been on these issues. If he was accosting people in the hallways, or interjecting his views during work related discussions, that would be another matter. Somehow, I'd be surprised if this was the case, just based on my general experience in these matters.
Those other considerations began in 2009 when the administration found out that Coppedge had occasionally had friendly discussions about ID with fellow employees. Coppedge was not pushy in these conversations; if a colleague wasn't interested, Coppedge dropped the matter. Nonetheless, one administrator yelled at Coppedge and ordered him to stop "pushing religion," which led to Coppedge filing a claim of harassment. But rather than Coppedge's harassment claim being investigated, Coppedge later learned that he was the subject of an investigation that charged him with creating a hostile work environment.