It can be. Have laws been altered recently to come in line with religious dogma at all, or have there been proposed changes to the law books along that line? That's what would set off alarm bells for me. People are going to believe whatever, really, but as long as they aren't dictating law I wouldn't be too concerned. Keep in mind one of the diciest things you can try to do with an indoctrinated person is convince them how wrong they are. You stand a good chance of triggering the backfire effect and making them believe things even HARDER than before. This happens a lot with political stuff as well.
I mean, honestly, if all they're doing is putting crosses everywhere, it really doesn't strike me as being that big of a deal. I mean, hell, a good chunk of the Ten Commandments coincide strongly with generic civilized ethical/moral stances anyway (don't steal, don't kill, don't lie, don't be an adulterer, afford some respect to your elders).
There have been other, ingenious solutions to this, btw - if one religion has representation in a government facility, then they all have to have it if they want it. This led to the hilarious Satan statue kerfuffle in... what was it, Oklahoma?