I am. And I can say with certainty that you're correct; Islam's Allah and the Judeo-Christian Deity are not even remotely the same. Allah was worshipped long before the invention of Islam by Mohammet; it was one of the gods worshipped in the Kaaba (itself a temple with a pantheon of 360 different gods before being rehabilitated for use by Islam). Culturally, there were absolutely no links whatsoever with this particular god and the God of Israel until Mohammet came along and borrowed (and incompetently corrupted) several stories from local Jews (and heretical Christians) in the area in creating the Quoran. He chose Allah to be his new "monotheistic" deity for Islam probably because it was his family's personal god, and as a child he had attended to that particular idol (his grandfather was a custodian of the Kaaba in Mohammet's youth).
Another misstatement often told by the unification camp is that "Allah" is just the Arabic name for God. It is not (that would be Ilah, a word almost never used since the time of Mohammet because of the cultural domination of Islam). Some suggest that "allah" was just a corrupted version of "al-ilah", but even the Mohammedans will deny that (and instead instead that "Allah" is a proper name, not a generic one like the English "God"). But even if it were true, the etymology would once again prove no historical connection between the two, since the "al-ilah" has the mesopotamian/sumerian LIL/IL (enlil, and later "allil") as a root, rather than the semitic EL of Judaism.
The only people I have ever seen who suggest the "it's the same God" are those either completely lacking in any archeological history of the region, or those completely lacking in any knowledge of Islam (a quick read of any of the Suras dealing with "biblical" figures rather quickly shows that any supposed commonality between the religions is laughable. Not only can the Quran not stand when compared to the bible; it can't even stand on it's own merit).