First of all, I'm not sure if there is any biblical passage that may be interpreted as the Jews needing to control all of Jerusalem.
But aside from that, I realized that Jerusalem is Judaism's holiest city while it is Islam's third holiest city.
Muslims already have all of Mecca for their holy sites while some want Israel to only have half of Jerusalem. So is the UN resolution in 1947 to blame for this? Do muslims really need all of Jerusalem as their Holy City? Or are Muslim extremists just greedy for land?