“Obnoxious and rude. I wonder what they’d say to a similar structure of a vertical sword supporting Islam? Think that would pass the zoning board without much fuss?”

The people you’re talking about will never see the point you’re making. They don’t see a giant cross as equivalent to a giant symbol of a different religion, because the different religion is “wrong”.

Obnoxious and rude is a virtue for religious people. Calling them out on it doesn’t shame them.