What is the ''language of Islam''?

Answer 1

Islam has no specific language. It is a religion. The same way you can't claim a language for Christianity religion. Islam is presently having believers spread all over the world. Accordingly, every Muslim is worshiping in his own language except few Quran verses and few praying words that he should know in Arabic.

The revelation of Quran, the holy book of Islam religion, to Prophet Mohamed by God through the Angel Jibril (or Gabriel) was in Arabic. This Quran revelation continued from year 610 until Prophet death in 632. So the original language of Quran is the Arabic. However, the Quran interpretation of its meaning is presently available in all world languages. The exact and accurate single translation of Quran into any language is impossible.

Answer 2

The Muslims may speak any language of their region. However, they must learn Arabic to recite and understand the Qur'an. This the last heavenly book that contains the basic beliefs, rules and regulations for the Muslims to follow. In this way you can say that Arabic is the common language of the Muslims.