Arabic speaking Orthodox, Melekite and Maronite Christians sing Qudduson Allah when Greek speaking Christians sing Hagios ho theos, and English speaking sing Holy God.
The point is the Allah of the Mohammedans is a lie, while the Allah of the Christians is the All-Holy Trinity, Father, Son and Holy Spirit.
That's right. You might also note that the Christian Maltese also call God "Alah" - and in 1565 they fought for Him with exemplary courage.