Sykes-Picot is the reason why the Saud family refused to recognize the "State of Israel" and encouraged other Arab states to do the same, wasn't religion. Arabs were fooled into rebelling against the Ottomans with the empty promise of a unified Arab kingdom..

Edit for context: Excerpt from the meeting with FDR and King Abdul Azin bin Saud https://www.brookings.edu/articles/75-years-after-a-historic-meeting-on-the-uss-quincy-us-saudi-relations-are-in-need-of-a-true-re-think/

The president opened by saying he wanted to get the king’s advice on the question of Palestine and the Jews’ desire for a state there. The Auschwitz concentration camp in Poland had been liberated by the Red Army three weeks earlier, and the full extent of the Nazis’ mass murder was now becoming clear to the world. FDR argued the survivors should go to Palestine, where the Zionist movement had been building the basis for a Jewish homeland for decades. The king was firm in his reply. “The Jews should return to live in the lands from which they were driven. The Jews whose homes were completely destroyed and who have no chance of livelihood in their homelands should be given living space in the Axis countries which oppressed them.” Roo se velt argued the Jews of Eu rope did not want to live in Germany. The king was unpersuaded, saying, “make the enemy and the oppressor pay; that is how we Arabs wage war. Amends should be made by the criminal, not by the innocent bystander. What injury have the Arabs done to the Jews of Eu rope? It is the Christian Germans who stole their homes and lives. Let the Germans pay.”12 Roo se velt tried another tack. The Arabs were numerous and their lands extensive; the Jews were few in number and sought only Palestine. The king looked FDR in the eye and quietly uttered one word: “No.”13 Then the president tried an idea that Churchill had suggested, that the Jews could build their state in Libya. Libya had been an Italian colony before the war and had a small population. Once again Ibn Saud rejected the notion of any part of the Arab world being ceded to the Jews. It would not be fair to the Libyan Arabs. “Give them [the Jewish survivors] and their descendants the choicest lands and homes of the Germans who oppressed them."

FDR decided to end this part of the conversation with a commitment to the king. He told Ibn Saud that as president “he wished to assure His Majesty that he would do nothing to assist the Jews against the Arabs and would make no move hostile to the Arab people.” His government “would make no change in its basic policy in Palestine without full and prior consultation with both Jews and Arabs.”15 The king was pleased with the president’s commitment.

...skip ahead in that document: In April, just a week before he died in Georgia, FDR wrote Ibn Saud a letter reaffirming his promise that he “would take no action, in my capacity as Chief of the Executive Branch of this Government, which might prove hostile to the Arab people.” He promised full consultation on Palestine. The king believed Roosevelt’s promise was binding on the American government.21 (spoiler alert: it was not)