We certainly can have a polite discussion about religion. Take a look at the one on the New Atheists. The term in question is inaccurate and dishonest. I'm not saying that you are dishonest, just that the term's roots and original intent are in the same way as terms like "Papist", "Mohammedan", "Heathen" and "Fire Worshiper". Its origins are an explicit attempt by certain Christians to co-opt Judaism as an appendage to or one end of Christianity. It is false in fact and ignores the dramatic ways in which the two religious currents have diverged.