Currently, the Palestinians are not united. The leader of Fatah in the West Bank is Mahmood Abbas. The leader of Hamas in the Gaza Strip is Ismail Haniyeh.
The main reason is probably the fact that Israel still exists, and shows no sign of being willing to evaporate.
It began with the religious conflicts where Palestinians were not ready for peace.
Jews and Palestinians.
This is incorrect. The English and Americans are not in conflict with "Israeli-Palestinians" (which is a meaningless term, just like French-Britons would be). As a result
The West Bank
no and it never will be.
Israel and The Palestinians were the main people in the Intifada.
Arabs, specifically Palestinians.
There is no conflict between the Palestinians and Hellenists because the Hellenists (as a movement) occurred around the 300s to 100s BCE and the Palestinians only really developed as an ethnic group by the 1200s CE.
Conflict with Arab nations and Palestinians
It depends what you mean by "Palestine". If you are referring exclusively to the Palestinian Territories, there are abuses by Muslim Palestinians of Christian Palestinians and the defacing of their holy sites and monuments. Additionally, there is a conflict between Jewish Israeli Settlers and Israeli Soldiers and Palestinians (both Muslim and Christian). If you are using "Palestine" as a shorthand for "Israel and Palestine", then the religions in the conflict are Judaism, Christianity, and Islam. However, those religions are not at conflict. The Israeli-Palestinian Conflict is a ethnic/nationalist conflict where religions are used as ethnic identifiers (similar to the 1990s in Yugoslavia). It is not a theological conflict.
The conflict between Israel and the Palestinians destabilizes the region and results in increased militarization among nations.