Yes, they do! I talk to a lot of people from the Middle East, and as I have been told, Christians do say that in Arabic. Something to remember is Allah (الله) just means God in Arabic, so it would make sense if Arab Christians do say ان شاء الله.
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Not at all! Arabic, is one of the 5 most spoken languages in the world, the language of the Quran, and is becoming a business language. See Is Arabic