There are indeed approximately a billion Moslems, but less than 200 million of them are Arabs. Arabs are an ethnic group, not a religious one.
Yes, I know the difference. I was writig quickly and should have typed Arabs/Moslems. There is not much significance to the distinction as all are/have been being radicalized. When a population becomes Moslem,(with a few exceptions) it loses its traditions and history and writes "arab" and "Quran" in the whited out spaces in its history books.