Not all Arabs are Muslims. Many are Christians and Jewish.
That is also the reason I switched from
Aviation Pro's "Arabs" to "Muslims". Many Muslims are not Arabs, e.g. Persians, Indonesians, Somalis, some Nigerians, etc.. Many non-Arab Muslims do share Arab Muslims' dislike/hatred for Israel.
My evidence-free speculation is that with both candidates' actions wrt Israel being disliked, that issue was off the table and other issues influenced Muslim US citizens' choices. Perhaps the Dems aggressive support of LGBTQRSTUVWXYZ and Trans' agendas?