What is a jew? What is Israel?

Have you noticed how nobody seems to know what a jew is? If it is a racial term, why did the geopolitical abomination known as Israel prevent baptized Christians from applying for citizenship and why do jews have seemingly religious customs? If it is a religious one, why is there a visible racial group and atheistic jews?

This is a companion discussion topic for the original entry at https://legiochristi.com/p/009c4cd0-c80b-483f-859e-710b05f1203a/