All right let there me an extra crucifix in history classroom beside the religion one. Next to it lets hang pictures of dead taborites and other "pagans" and pictures of Perun and Swiętowit.
Would those be hanging above or below The Star-Spangled Banner? I wonder how those stars help Americans. Do they have to do with Hollywood or space travel? Are the stripes really a symbol of pyjamas?
How about the teddy bear (Berlin). Would that mean people in Berlin hunt bears? Hug them? Screw them?
Is there any zoo-philia going on among some of the British nobility who use lions among their symbols? Or is it just a love for cats?
Symbols are all around us. Like it or not.
My only point is that you incorrectly approached the meaning of the crucifix in the context of Poland's history. That is somewhat understandable since you obviously have little knowledge of Polish history.
Poland's acceptance of Christianity was critical in the creation of the Polish nation, and on many occasions, it its survival. I have an impression the topic is crucifixes in Polish schools that are paid for by that same Polish nation.