Yahweh, the God of Abraham, Isaac, and Jacob, is not the same as Allah

 Orthodox Jews do not view Allah as the same God worshipped in Judaism for a few key reasons:

Islam rejects the divine origin and eternal validity of the Torah, which is a fundamental tenet of Judaism. The Quran denies that the Torah is the uncorrupted word of God. For Orthodox Jews, rejecting the Torah is tantamount to rejecting God Himself.

Islam does not accept the Jewish understanding of God's covenant and unique relationship with the Jewish people. Orthodox Judaism sees this covenantal relationship as central to the Jewish conception of God.

While Islam affirms monotheism, it rejects certain core Jewish principles about God, such as God being incorporeal and rejecting any notion of God having physical or human attributes. The Islamic conception of God differs from the Jewish one in key ways.

Islam denies the Jewish belief that there can be no prophets after Moses, rejecting the finality of Moses' prophecy. Muhammad's status as a prophet is incompatible with Orthodox Jewish theology.

Some Orthodox authorities argue that accepting Islam's validity would be akin to denying the Torah, which is considered a capital offense in Judaism. They view Islam as a separate religion, not just an offshoot of Judaism.

In essence, while Orthodox Jews acknowledge Islam's monotheism, they view the Islamic conception of God and theology as fundamentally incompatible with core Jewish principles regarding God, Torah, and the Jewish covenant. The differences are seen as too fundamental to consider Allah the same deity worshipped in Judaism.