It still is, they messed up and added a Muslim chant to the music.
Its part of Islamic prayer or can become part of it. Hence it becomes offensive...
In Islam, God can't be equated to anything on or anyone. This becomes even more problematic with it being a stage about idols, which Islam strongly prohibits.
Here's a thing. When Muslims pray: It goes like this
1) Recite two known required surahs (chapters from the Holy Quran.
2) Recite a Surah (Chapter) of your choice from the Holy Quran.
This happens on what prayer the person is reciting.
Another thing is unlike the Bible that has been translated from its origin. The Holy Quran is only read in Arabic (not today's Arabic language, but ancient Arabic).
Hence the situation that we are in.
PS: I am not offended or anything like that. I am just trying to explain why some might find it offensive.