The Arab rejection of the State of Israel is one of the central reasons for the Arab-Israeli Conflict. The rationale is rather straightforward. Since the Arabs refused to recognize the validity of the state, they promote strongly worded rhetoric opposing it. This motivates citizens of Arab countries to have nothing but hate towards Israel and to be willing to fight to eradicate it. This strong will has led to actual wars against Israel and terrorist attacks against Israeli civilians.
There is no such conflict. Abraham and his grandson Israel were never in conflict according to the Bible. There is also no conflict between the patriarch Abraham and the Modern State of Israel.
Zionism is one of numerous causes of the Arab-Israeli Conflict and the Israeli-Palestinian Conflict. Zionism is the philosophy that the Jewish people should have a nation-state just like the German people, Turkish people, Greek people, and so on. Without Zionism, there would be no State of Israel, and hence any conflicts associated with that state would not exist. However, the mere existence of the State of Israel does not cause conflict; the existence combined with its rejection by its neighbors for various reasons.
This conflict, surprisingly enough, took place in what would become the territory of the State of Israel.
Because of religious reasons.
It occurred in the State of Israel and its environs.
The major disagreements between the "Palestinians" and the state of Israel narrow down to two brazen aspects of Israel's behavior in rejection of almost universal world opinion: -- The obstinate insistence of Israel on its right to exist as a Jewish state in the Middle East, and on its unapologetic intention to continue doing so. -- The stubborn refusal of Israel and its people to die in armed conflict, to accept rocketing of their residential areas with a wink and a smile, and in general to relinquish their uppity attitudes and just go away.
The ongoing core-issue is the existence of a Jewish state in the region ... a fact of life with which those who oppose it are unable to find visceral peace.
Zionism is certainly one of the causes of the Israeli-Palestinian Conflict. It is not the only cause of the conflict and is also not the most important cause of the conflict. Zionism is responsible for the existence of the State of Israel since Zionism was the Jewish Nationalist movement to establish a Jewish State in the Land of Israel. Without Israel, there would be no Arab-Israeli conflict. However, it is worth noting that while Zionism is a base cause of the Arab-Israeli conflict, numerous other far more lethal conflicts (like the Iran-Iraq War) have nothing to do with Israel.
Israel's very existence provoked conflict. Israelis did not have to do anything to create the Arab-Israeli Conflict, the Zionist Jews' intent to create a state led to violent confrontations by Arabs throughout the 1920s, 1930s, and 1940s, before Israel's independence in 1948.
A result of that conflict is the very existence of the State of Israel.
It created a Jewish state on land that most Arabs believed rightfully belonged to the Palestinians.
There have been a vast number of Israeli leaders throughout the State's history. Since the Israeli-Palestinian Conflict has been a part of Israeli politics since the State's inception, all of those leaders led Israel through that mess.