An individual expression of the 10 can - unless you do your own version, must - be explicitly Jewish or Catholic or Protestant. The division of the list into 10 things differs. Importantly, the Jewish version makes "I am... God" a whole commandment on its own, and "have no other" is relegated to 2. And the Catholic version just skips the whole "no graven images" thing. So you *can't* post the ten without immediately picking a side, not just Jews vs Christians, but Protestant vs Catholic. Yikes. Beliefnet has a comparison chart of the three versions.
The sidesplitting thing about the whole Judge Roy Moore putting The Rock into the courthouse - and going on tour with The Rock as a speaker - was that he tried to have it both ways: The Rock has ELEVEN commandments on it. Easy to check me. Google moore and "the rock" and of course commandments and hit images - there's one big enough to read the surface. It has the Jewish number one, but then all the Protestant ones, for a total of eleven.
It's a great example of the reason WHY you want separation - we have centuries of experience of this kind of issue leading to riots and warfare.