This is a historically fallacious argument.
The Jews hardly worshipped a new deity when they began worshipping El. The Cannanites and Ugarites worshipped an El who looked nothing like the El in the Bible. Yet that did not prevent Moses from using that name for God quite profusely.
The fact that pagans used the same name in worshipping one in their pantheon does not preclude Allah from being the same entity that the Jews and the Christians worship, albeit understood quite differently (and, as a Christian, I must say wrongly.) Arabic Christians refer to God as "Allah," and ultimately, "Allah" is a linguistic corruption of the tetragrammaton YHWH.
This debate - whether or not the entity is the same - is at best a red herring. What matters, rather, is how God is understood by the Jews, the Christians, and the Muslims. As a Christian, I have to say there is only one right way to understand God, and neither the Jews nor the Muslims fully comprehend it, though both may have an inferior understanding of the True Faith. What word they use is irrelevant. Islam and Judaism, by their terms, claim to worship the same God as I. I must take them at their word, and engage them on theology, not semantics.
No, it is a fact.
The Jews hardly worshipped a new deity when they began worshipping El. The Cannanites and Ugarites worshipped an El who looked nothing like the El in the Bible. Yet that did not prevent Moses from using that name for God quite profusely.
That is because "EL" and "Elohim" are generic terms for "god/gods", not a proper name like "Yahveh" or "Allah".
Arabic Christians refer to God as "Allah,"
Arabic Christians did not do so before Islamic domination of the region. There are similarities with the Syriac, but that is irrelevant considering that the archeological evidence of the existence of the non Judeo-Christian Allah pantheon is not in doubt and long predates that usage.
and ultimately, "Allah" is a linguistic corruption of the tetragrammaton YHWH.
It is no such thing. Allah is a proper noun, the name of a specific deity. Some will assert that it is a corruption of "al Ilah" (Ilah being the Arabic name for God), but no competent linguist has ever asserted that it is a corruption of "YHWH". Whoever told you that was clueless.
This debate - whether or not the entity is the same - is at best a red herring.
You are in error. The identity of God is relevant, not merely the form of worship. To equate the worship of YHWH with worship of Allah, Vishnu, or Zeus is the beginning of an error which can only reach erroneous conclusions.
What word they use is irrelevant. Islam and Judaism, by their terms, claim to worship the same God as I. I must take them at their word,
So if a Luciferian Gnostic or a Kali disciple claims to worship the same God as you you will "take them at their word" as well? Or do the Muslims for some reason deserve special treatment and the rules of evidence do not apply to them?