So, You Want to Say Palestine is Somehow a Made up Concept.

I am assuming that you must be a Zionist of some kind to say that.
In that case, you at least know the significance of the Balfour Declaration. You are a real no hoper if you don't.
But, whatever the case is, you are pretty ignorant if you don't know something about the Balfour Declaration and what it means to the Zionist cause.
So, I am going to review it for you. Please try and wrap your head around this:

The opening words of the declaration represented the first public expression of support for Zionism by a major political power. The term "national home" had no precedent in international law, and was intentionally vague as to whether a Jewish state was contemplated. The intended boundaries of Palestine were not specified, and the British government later confirmed that the words "in Palestine" meant that the Jewish national home was not intended to cover all of Palestine.

The Balfour Declaration was a public statement issued by the British Government in 1917 during the First World War announcing its support for the establishment of a "national home for the Jewish people" in Palestine, then an Ottoman region with a small minority Jewish population. The declaration was contained in a letter dated 2 November 1917 from the United Kingdom's Foreign Secretary Arthur Balfour to Lord Rothschild, a leader of the British Jewish community, for transmission to the Zionist Federation of Great Britain and Ireland. The text of the declaration was published in the press on 9 November 1917.
Immediately following Britain's declaration of war on the Ottoman Empire in November 1914, it began to consider the future of Palestine. Within two months a memorandum was circulated to the War Cabinet by a Zionist member, Herbert Samuel, proposing the support of Zionist ambitions in order to enlist the support of Jews in the wider war. A committee was established in April 1915 by British Prime Minister H. H. Asquith to determine their policy towards the Ottoman Empire including Palestine. Asquith, who had favoured post-war reform of the Ottoman Empire, resigned in December 1916; his replacement David Lloyd George favoured partition of the Empire. The first negotiations between the British and the Zionists took place at a conference on 7 February 1917 that included Sir Mark Sykes and the Zionist leadership. Subsequent discussions led to Balfour's request, on 19 June, that Rothschild and Chaim Weizmann submit a draft of a public declaration. Further drafts were discussed by the British Cabinet during September and October, with input from Zionist and anti-Zionist Jews but with no representation from the local population in Palestine.

Here is the actual document, please read it...
You got that? It uses the word "Palestine".
There is more than enough evidence that the territory was called Palestine before 1948.
Now, go and shut the fuck up because you are talking shit.