I'm learning the history of the region lately. I don't have established opinions but I'm reading to learn. But in general I think there is no coalition between Arab states, or Muslim countries. As someone originally from Turkey, I can safely say Turkey's assumed enemies are more aligned with Israel's enemies such as (Assad's) Syria or Iran because of sect differences or historical reasons. Having said that, I am strongly against attacking another country to make regime changes. The reason I'm saying that, defenders of Israel on this thread (or in other social media channels) keep referencing to huge number of Arabs in the region or many Muslim countries while portraying Israel as singled out against them as if they are all in agreement. In practice, this is far from reality.
Regarding, your specific question about 1948 war, I'll quote excerpt from the same book, The Israel Lobby and U.S. Foreign Policy (John Mearsheimer, Stephen Walt) :
"While there is no question that Israel faced serious threats in its early years, the Arabs were not attempting to destroy Israel in any of those three wars. This is not because the Arabs were happy about the presence of a Jewish state in their midst—they clearly were not—but rather because they have never had the capability to win a war against Israel, much less defeat it decisively. There is no question that some Arab leaders talked about “driving the Jews into the Sea” during the 1948 war, but this was largely rhetoric designed to appease their publics. In fact, the Arab leaders were mainly concerned with gaining territory for themselves at the expense of the Palestinians, one of the many occasions when Arab governments put their own interests ahead of the Palestinians’welfare. Morris, for example, writes: What ensued, once Israel declared its independence on 14 May 1948 and the Arab states invaded on 15 May, was “a general land grab,” with everyone—Israel, Transjordan, Syria, Egypt, and even Lebanon—bent on preventing the birth of a Palestinian Arab state and carving out chunks of Palestine for themselves. Contrary to the old historiography, Abdullah’s [king of Transjordan] invasion of eastern Palestine was clearly designed to conquer territory for his kingdom—at the expense of the Palestinian Arabs—rather than to destroy the Jewish state. Indeed, the Arab Legion stuck meticulously, throughout the war, to its non-aggressive stance vis-à-vis the Yishuv and the Jewish state’s territory … It is not at all clear that Abdullah and Glubb [the British general who commanded Transjordan’s Arab Legion] would have been happy to see the collapse in May 1948 of the fledgling Jewish republic. Certainly Abdullah was far more troubled by the prospects of the emergence of a Palestinian Arab state and of an expanded Syria and an expanded Egypt on his frontiers than by the emergence of a small Jewish state.19 And Abdullah, as Morris notes, was the only Arab leader who “committed the full weight” of his military power to attacking Israel, “indicating either inefficiency or, perhaps, a less than wholehearted seriousness about the declared aim of driving the Jews into the sea.” Shlomo Ben-Ami, a noted historian and a former Israeli foreign minister, has a similar view of Arab goals in the 1948 war: “Ill prepared and poorly co-ordinated, the Arab armies were dragged into the war by popular pressure in their home states, and because their leaders each had his own agenda of territorial expansion. Securing the establishment of a Palestinian state … was less of a motive for the Arab leaders who sent their armies to Palestine than establishing their own territorial claims or thwarting those of their rivals"