I'll try to answer your questions:
"Is it true that Isrealis think that the west bank belongs to them?"
Legally the West Bank has not been annexed to Israel so it is not part of the state of Israel. The status of various parts of the West Bank is currently stuck in the aftermath of the failed Oslo accords, and is awaiting future resolution. Some Israelis on the right think that the West Bank belongs to Israel and should be annexed, but this is a minority view. Most Israelis realistically think it will become part of a future Palestinian state even if they don't expect the conditions for that to happen to occur particularly soon. Most Israelis also don't really treat the West Bank as an integral part of Israel - they are more reluctant to go there as it is perceived as dangerous, or some on the left like me would prefer to avoid going there for political reasons, though I do go through the West Bank to visit friends or to get to somewhere like the Dead Sea.
’Also, do you believe that immigrants jews have more right to the area than the people who were living there?’
Not sure if this question refers to the West Bank or to Israel in general. If the former, see my previous answer. If the latter: I think the question is phrased in a disingenuous way. I believe that the State of Israel has the right to establish immigration policy. I think that while we are still within living memory of the Holocaust it is very important to most Jewish people worldwide that Israel exists as a safe option for immigration of Jews (by the way as I pointed out somewhere above, Armenia, whose citizens suffered a genocide, also has a similar immigration policy). Palestinian citizens of Israel (those who stayed in what became Israel after 1948) have and should continue to have equal rights as citizens, and every effort should be made to ensure that those rights are not compromised.
Separately, I think that the Palestinian refugee problem urgently needs a just and lasting resolution. I don't think that such a resolution should involve all of the descendants of those who left and/or were expelled in 1948 having an automatic right to "return" to locations within the state of Israel that their ancestors left over 75 years ago, just as I don't think that the descendants of Israeli Jews who fled Iraq, Syria, Egypt and other Middle Eastern countries should automatically have the right to "return" to those countries. Such movements might be seen to correct historical injustices but at the price of creating vast new injustice and instability. The implication of a full Palestinian right to return to areas inside the State of Israel is essentially the destruction of the State of Israel by demographic means as Jews will become a minority. See previous posts of mine for why I think that two state solution is the only practical way to solve the Palestinian-Israeli conflict.
When people say "the people who were living there" (in 1948) they generally intend not only the
Of course it is essential that there should be a just and permanent resolution to the Palestinian refugee problem. However, I don't believe that the State of Israel should be
“Many of the Palestinan Christians were originally Jewish, descendents of the jews who accepted Jesus Christ so how did they lose their ethnicity? Like shouldn't they automatically be recognised as ethnic jews?“
People should define their identity themselves rather than have outsiders do that for them, and I'm not aware of Palestinian Christians wanting to be considered as ethnic Jews. Second, being Jewish isn't only a matter of ethnicity - it's also a group identity and a religion. There's no such thing as automatically being recognised as Jewish on the basis of DNA if you don't have any connection to the Jewish community or religion.