Think about it. The x's are a type of cross. When Jews immigrated to the US, illiterate ones signed their name with a circle. They refused to use an X. Thus X's are Christians and O's are Jews.

There is no way to play it without being antisemitic. If the O's win, then of course they do, everyone knows that the O's are in power and control everything. And if X's win, then it must be because they are against the O's and hate them.

I'm surprised that nobody has raised this as an issue.