[Fionn mac Cumh]

I have a question for you all. Is it really wrong to call GOD allah? Isnt that the Arabic form of the word GOD and not a name for GOD? I have heard Arab Christians in the middle east use Allah for GOD even though they are not muslim. I guess im saying is it wrong to use the arabic word for GOD if you are Arabic? I say GOD because I speak english. My hispanic brothers say DIOs. What say you all?