Judaism and Christianity are both from the same root. Islam, on the other hand, is a rejection of the promises to patriarchs from Abraham to David. Thus, if you are to base tenure in Israel to the promises of the Old Testament, then the Muslims have apostatized and placed themselves outside of those promises. The same cannot be said of the Christians. They represent the fulfillment of those promises.
As for the Christians supporting Israel, what is your definition of that support. To support Israel must the Christians declare that those ethnic Jews who reject Jesus as the Messiah have special rights to the land that ethnic Jews who profess Jesus do not?
Christians are not Jews. Jews reject Jesus as messiah. What is your definition of a Jew anyway? If I convert, am I a Jew? If my great-great-great-grandparents were Jewish but then converted to Christianity and since then every generation was Christian, am I a Jew? So no Christians have no right to Israel just b/c their ancestors were Jewish any more then Europeans have the right to Africa b/c their ancestors came from there many years ago.
Christians NEED to realize that OBSERVANT Jews are the ones who are the only ones w/ the right to Israel. We wouldn't want people who hate America coming into America and forcing policies on the rest of us to have their anti-American practices me given place in the gov. would we? So I believe the same should be true w/ Israel. If Christians love Israel they would realize it is a state for OBSERVANT JEWS ONLY.