I am also a muslim and i would have laughed only because i know what your intention was behind what you said and that you dont completly understand our beliefs.
But i can understand why they may have felt uncomfortable,you see in islam we dont classify God as a man like christians do,and its actually a major sin to attribute god to man in any way for us.
But knowing that alot of people dont understand our belifs 100% and you were only being polite and lighthearted they should have been abit nicer about it.
Hope that helps you understand
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