Just a few points:
Also note that despite the claims of the Muslims that Allah is the God of Abraham, this claim must be false when scriptures are compared.
Except that they both use the same original scriptures. Islam just adds on the words of their prophet similar to what Christianity does.
Similarly, when scripture is compared the Islamic "Mehdi" pretty much has the characteristics given of a Christian Anti-Christ (there is more than one, this one just happens to be the one most detailed in Revelations).
Except that the concept of "anti-Christ" does not exist in the original scriptures. Only in the addendum of the Christians.
I'm an atheist so "have no skin in the game", I'm just giving a comparison of mythologies since that comparison is not known even to most religious and educated people.
The problem is that none of the mythologies make any sense unless you are already a believer. So comparing three mythologies that do not make sense to each other will not result in any insights except that they are different.
From your link:
Are we to assume that just because the Quran states that Allah is Yahweh of the Bible that both Jews and Christians are obligated to believe this to be true?
Are you obligated to consider MY fan-fiction to be canonical? Am I obligated to consider YOUR fan-fiction to be canonical? Particularly when the ORIGINAL material was a "shared-world" effort with lots of individual contributors who dealt with a lot of allegories and parables and such.
Yet, the Quran teaches that Allah is the author of evil:
When you have a monotheistic religion where EVERYTHING was created by a single omnipotent, omniscient god then arguing about whether that god created "evil" or "sin" is kind of silly.
Whomever wrote the link that you linked to has a religious point-of-view.