>>24529632
To advocate for the devil, they may simply mean what most Muslims mean, that is, that the Quran recited in Arabic is beautiful. In fact, it was Muhammad's special, as in retarded, argument for its divine origin. To be sure, it can sound nice enough:
https://m.youtube.com/watch?v=9xWm3sRS8mA

But uniquely beautiful? That's not an argument. I prefer the random following example myself:
https://m.youtube.com/watch?v=UpVazaj4lH4