The borders in the Arab world were drawn up by Europeans after WW1. They did the same thing in Africa. Borders are a human construct. Palestine does in fact exist in the sacred texts of the Abrahamic religions. A quick google search can confirm this for you. Lastly, here's a source on Israeli apartheid: https://www.amnesty.org/en/latest/news/2022/02/israels-apartheid-against-palestinians-a-cruel-system-of-domination-and-a-crime-against-humanity/