Complete nonsense, I regret.
Allah, Elah, Eloah, etc etc are just names for (the supreme) God, and derive originally from the Canaanite El and thence from the Akkadian & Sumerian Anu (sky god). They are just names. The only issue when it comes to "which God" is the particular revelation of God. Thus in Canaanite Ugarit, El was still part of a pantheon, despite being the supreme god, and bore no proper relation to the biblical El who became from the time of Moses, associated only with the revelation of YHWH, and before that, with personal revelations to Abraham.
The Islamic Allah bears no relation to the Christian Allah, even though they bear the same name vis-a-vis the Arabs. The Islamic Allah is modelled on earlier ba'al type deities, i.e. assimilated with the foreign Hu'bal god of the Kaabah (a moon god), as well as Jewish and 'custom' elements laid down by Mahomet. Hence the moon on Islamic flags. Even the Christian YHWH bears little relation to the Jewish YHWH because of entirely separate theology.
So when it comes to God, what is important is not so much the name, as the revelation it implies. The Islamic revelation denies Jesus as the son of God, as equally as it denies Jesus as God the Son. This was Mahomet's fatal mistake, but not one made by the martyr Servetus put to death by Calvinists (& also so sentenced by Catholics) who owned Jesus as the son of God, but not God the Son.