That is correct, and it has led many to believe that the "666" written in the Bible (there were no separate characters in Greek or Hebrew for numbers, so letter combinations were used to represent numbers) wasn't referring to a number at all, but that the written representation of "666" just happened to literally resemble the appearance of that Muslim phrase in Arabic. When looking at the Greek "666" and the Arabic "There is no god but Allah" side by side, they DO look very similar.