"Allah" did not write the Quran. The Quran was dictated by a human under the influence of a demon pretending to be the angel Gabriel, to turn people away from God. It does so by mixing lies with a whole lot of truth to make the lies more convincing. This is not what I am talking about. As
@MemeFan said, we all agree on the evils of Islam, there is nothing to debate there.
The question is about the meaning of the word "Allah".
The relevance to Christian ministry is how we relate to Muslims. Do we teach them that they misunderstand God and need to improve their understanding of Him (teach them to discern truth from lies, keep the truth they already know and correct the lies)? Or do we teach them that they have been worshipping a false god all their lives and need to throw away everything they know and start worshipping an entirely different god?
As we all agree Islam is wrong and we need to turn people away from Islam and towards Christianity, the profitable question to discuss is "how do we go about this?". And that is dependent upon the meaning of "Allah".