Israel invades the gaza strip.

I think it should've been pretty clear that the arab countries do not want any more jews on-top of the population that they already had(again, religious threat). and what about the palestinians that were killed by the jews ? The UN shouldn't have meddled with the arabs in the first place.

Again, what is this "religious threat" you speak of?

Also, the area was under British rule, after the Turks were defeated in WWI. The British interefered everywhere. They brought in a Saudi sheik to rule over trans-Jordan, which was populated by Palestinians. Jordan still has a Palestinian majority, but whenever they rebel, the King there puts it down. (google "black september") And the British brought the issue of the area between the sea and the river to the UN to resolve, because there were already areas of Jewish majority here. The UN voted to give those areas to the Jews for self-rule, and the rest to the Arabs.
That the Arabs didn't want the Jews here was known, but the Jews had no other place to go. This is their only homeland, no matter how long most of them had been exiled from here. They came and settled peacefully, in empty areas, or purchased property fair and square. When they were attacked they defended themselves.