Does Israel define who is a Jew and who is an Arab by religion or by physical appearance?
First of all you present a complete fallacy as fact – anybody can immigrate to Israel just like they can immigrate to any country in the world. While it is true that immigration for Jews is easier (this has proven necessary for a number of reasons), Israel has made many exceptions in the past. For instance Israel has given hundreds of Darfur refugees Israeli citizenship so that they could escape the atrocities of their own country*. The distinction between people are made by the people themselves and not the government. If you live in Israel and declare that you were a Muslim, the state would recognize you as such. Conversely they would recognize you as a Jew or a Christian if you declared yourself to be of that religion. Arab is a very inaccurate term to use as there are Jewish Arabs, Christian Arabs and Muslim Arabs in Israel. In terms of Israeli citizens, if there is segregation it is due to du joure segregation. Israel is a democracy and the government does not force people to like