I’ve been thinking about this for a long time. Seems that saying that the Muslems worship the one God is bothersome to Catholics. But let’s take a hard look at it.
I think about the samaritan woman at the well in John 4. The Samaritans were a product of the northern captivity. They were a mix of jewish and syrian blood as I understand. They did accept the God of Israel but only as one of many gods. I am sure if one studied them he would find many errors in their theology about God. I am sure they did not believe in a trinity for instance. But when Jesus speaks to her about God, what does he say:
“The god of the Samarians is a false God”. No wait, he says:
22] You worship what you do not know; we worship what we know, for salvation is from the Jews.
He does not say the god they worship is a completely false god or a demon. He simply says they do not know God whom they worship.
I asked a Muslem one time if his God was omnipotent, omnipresent, omniscient. His answer was yes. Creater of all things? Yes. The only God? Yes.
Now tell me, why should I tell him his God is totally false? Granted he has some errors. Alot of them. Now we are all getting hung up on the word Allah. A Hebrew word for God is Elohim. The pagans also used this word for gods. Does that mean the word is wrong? The Turks use tangray for God. It has pagan orignies as well. Deus is German I believe. Do you suppose that it originated from Zeus? Could be?
When Paul went to the Areopogus in Acts 17 he did not condemn what they new about God that was right. He even quoted their pagan sages. In him we live and move and have our being. He spoke their language and appealed to what they already understood. We don’t need to embrace islam or make it a common practice to call God Allah (though it just means God in Arabic). But it will help to appeal to what they already know.