I just read (i'm a bit slow, i know) this article by Alan Grey responding to the suggestion that we should all call God 'Allah'. (I would have replied in a comment, but the captcha system employed by blogspot.com doesn't want to play nice.)

While theologically, i absolutely agree that Christians and Muslims are not talking about the same being, i've always had a practical and linguistic problem with this argument: the idea that the term used to describe something must be be distinguished from its referent.

Middle-Eastern (Arabic-speaking) Christians call our God 'Allah'. I've actually listened to a sermon (in Arabic, that i couldn't understand) on 'jihad' in an Evangelical church in the Middle East - their word for evangelism! :-) One can readily argue that the referents of the terms 'Allah' and 'jihad' are different for Christians and Muslims, but they simply don't have better words to use.