Tell a devout Muslim that his Allah is the same as the Judeo/Christian God and you might find your head separated from your body.;-)
The Koran views the Arabs as the true heirs of Abraham (through Ishmael) and makes constant and worshipful references to the God of the Old Testament Bible. The Koran also contains a mini-gospel of the ministry of Jesus (Isa) and His birth of Mary. It hints, however, that Christ somehow survived the Cross. Islam does not think that Christ is God but it counts Him as a great prophet and miracle worker. In fact, if you talk to a Muslim about Christianity he would be likely to tell you that Muslims are greater friends of Christianity than the Jews, who never recognized the importance of Jesus till maybe in the previous Century, and consider Him an apostate of the Jewish faith. You head will be where it is now.
In Indonesia and Peninsular Malaysia they want to legally ban Christians from using the word "Allah" in their Arabic-language Bible translations, even though "Allah" is the only Arabic word there is, for God.
On the other hand, in the Middle East, Christians were using the word "Allah" in their Arabic translations for 400+ years before Mohammad was even born. It is also often used by Bahá'ís, Maltese Christians, Mizrahi Jews and Sikhs in Malaysia.
Mohammad, who evidently was influenced by early contact with Nestorian Christians, used "Allah" because that was the only current name for "the God" as opposed to the various subordinate gods, goddesses, angels and djinns.
Allah in Arabic is the equivalent of the Greek "ho theos monos" -- the One God.