The Quran, Muslims holy book, was revealed in Arabic by God to prophet Muhammad (PBUH).
Mecca is the Holy Land not the city
Hindu
Judaism
Islam
The Koran (sometimes spelled Qu'ran or other variations) is the sacred text of the Islamic religion.
Arabic Language Islamic Studies Islamic Shariah Principles of Religion (These are studied at University)
Your question is too general to provide an exact answer. However in times past the language of religion was "Latin" and it is likely that if by "sacred music" you mean sung chants, then these would be in Latin.
Islamic is not a language...it is the religion of Muslims....Muslims follow quran an d quaran is written in Arabic if u want u can speak Arabic
Arabic became the common language of Islam due to the spread of the religion across the Arabian Peninsula and beyond. The Quran, the Islamic holy book, is written in Arabic, and so the language became central to the practice and dissemination of the faith. Additionally, early Islamic scholarship and administration were conducted in Arabic, further solidifying its importance in the religion.
Islam as a religion is the glue that holds the Islamic World together.
The Islamic sacred text is called the Qur'an
Islamic architecture is a term used to describe any building that Islamic principle was considered in its design, regardless of its function, therefore the Islamic architecture is not sacred itself. But the term often mistakenly used to describe "mosques" only, the places of worship in Islam and are very sacred for Muslims.