Yes, it's Arabic. Noble Quran is in Arabic and we muslims make rituel prayer in Arabic too.

yas . arabic main language of aslam but you can read about islam in english (http://www.islam-guide.com)

the answers are almost the same with Eda and Multani. Arabic is a must in as a language of Islam. For an example when reciting the Holy Quran and doing the salat (prayers) Reciting or pronuncing the Holy Quran ( Kalimallah - Words Of Allah Subhanallahu Taala) MUST be in best possible manner/way to one's ability. Learning to read and recite the Holy Quran ( Tajweed) as well as understanding the meaning/translation is a compulsory to all Muslims. This followed by practising the Commands which God (ALLAH) have send down to us. The arabic words in the Holy Quran ( WORDS OF ALLAH) isnt that similar to other languages or dialects use in the middle east country. Urdu has some words related to arabic words because of the influence of Islam. some similar words in arabic words use in some countries are many. for example : DUNYA ( Turkish, Urdu and Jawi or Malay) another example : zaman ( turkish, malay, Jawi and Pakistan) these are some i can think of right now :) Thank you for sharing this question

the Massanger of god spoke in arabic only, so any thing related to islam in arabic language, but that does not mean to be a muslim you need to speak arabic, what i want to say you can be a muslim better than the arabic speakers with out speaking arabic language.

the main language of islam is the arabic and there is no connection between arabic and urdu all the muslims have to pray by "Quran" in arabic language even the turkish or malaysian or any other place