Has a non-Jewish or a non-Christian symbol ever been removed from government land/property?
A more appropriate question might be whether a non-Jewish or non-Christian symbol has ever been placed on government land/property.
If you consider them “religous”, there were Native American symbols removed from land when the US government took it over.
For example, parts of the Black Hills in North & South Dakota were sacred to them, but were suddenly taken over when they discovered gold (white man’s true religion) in those hills.