[quote=DaveBj]If Allah of the Qur’an and Yahweh of the Bible were the same, then their characteristics, as contained in the writings revealed by them, would be the same.
The characteristics of Allah, as revealed in the Qur’an, do not match the characteristics of Yahweh, as revealed in the Bible.
Therefore, they cannot be the same.
I’m not sure I accept the first premise. The converse is true, I’m pretty sure: If their characteristics are the same, then Allah and Yahweh are the same God. But I think the same thing can be known under two differing descriptions.
I think your argument would have the same form, but arrive at a false conclusion if you substituted “Christian Trinity” for “Allah” and “New Testament” for “Qur’an”. That makes me think there is something wrong with the form of the argument.
In general, I think you need to relax your standards for meaning and reference. Otherwise, we each have our own, private God(s) and our own private languages.