I agree that the justification of "land promised by God" is not okay because it sets one religion above another. But most borders in the world have been forged by war or some form of violence. Israel is exceptional in that its borders were set by international law, in response to the worst atrocity against a religious group in European history. It is the only Jewish nation in the world. There is only one explanation of why the left-wing is so obsessed by this border dispute over and above the huge number of others, and that is anti-semitism. It is so ingrained in their narrative that they probably aren't even aware of it (and they love the idea of unconscious bias).
No problem in criticising the actions of the Israeli government, but anti-Zionism is anti-semitism. I feel ashamed that our country has allowed this scourge to grow, particularly when my parents' generation lived through the Holocaust.
I'm not against the existence of Israel for more than one reason in the modern day but that's a different topic.
However, purely for objectivity a couple of things should be said in relation to a point in your post.
We can argue (not that I'm that interested in it) on whether what the UN gave to the Jews after WW2 was valid or justice or whatever.
However,
Israel never stuck to the borders that the UN gave them (enforced by the British) and used the importation of millions of Jews over twenty years (allowed by the British) to start by forcing out the British by terrorist groups (the leader of one they later elected PM) by murdering our troops.
But once having forced out the British by bombing and hanging our troops (never apologised) but soon after they soon forced out 700,000 mostly Muslims living outside their set boundary by forcing them out and if they wouldn't move killing them. These weren't military they were civilians being attacked by Jewish militants mostly armed illegally (another story in of itself).
Is someone antisemitic if they regard that as wrong?
I don't so easily forget the murder of our troops as easily as career politicians do.
No, I don't have to like the net effect of Muslims and their own colonizations and wrong doings..... to say that in the modern world that's wrong......What wrong did Muslim civilians living outside the UN boundary do?
Since then they have continually expanded, even beyond the 1967 borders that become a compromise position later on. Not all those wars were started by them but they all resulted in Israel expansion due to several reasons....again beyond the scope of my post.
Resistance to Israel's expansion has become known as antisemitism.....It's not my war and I'm hardly pro Muslim due to what they do to others themselves.......but I find it quaint to know the history and still think it's all fine and dandy...and then get called anti semitic if you stay true to the history.
Not because I prefer Muslims to Jews....in fact it's very much the opposite.
But just if you stay objective.
But I find it quaint that if you have an issue with what happened and what's happening....which is essentially colonization by force of arms that it gets called antisemitism....In other words that you just hate Jews....even though I want British Jews to stay in my country and for Muslim trouble makers to be booted out.
But when if it was the British colonization and empire building in the past....that instead gets continually rejected as evil by everyone. No one says it's racial hatred or anti white or anti British or whatever to attack us....it literally gets taught in the schools that what we did (which every nation did at some point) was wrong and evil and no one bats an eyelid.....Even though I regard this lefty worldview as out of context and lacking nuance.
There is a double standard there.....and when you dig into it...the reason why is obvious.