I'll agree that many people don't want to know the truth about Islam. And if they do they won't get it from you.
This kind of response is nothing less than a, ahem, non-sequitur!
The Crescent Moon is the clue and it goes right past you, evidently. It is to Islam what the Cross is to Christianity. It is Islam's primary symbol.
Everything in Islam revolves around the Moon, literally so with its calendar, but the same with its symbology.
The unasked question is why the fasting from Crescent Moon to Crescent Moon? Why the omnipresence of lunar symbols all over the place in that culture?