You know Korravai, there is a confusion between Arabs and Muslims, but all the Arabs are not Muslims and all the Muslims are not Arab
I found this for you Korravai :
"Arab" is defined independently of religious identity, and pre-dates the rise of Islam, with historically attested Arab Christian kingdoms and Arab Jews. The earliest documented use of the word "Arab" as defining a group of people dates from the 9th century BC. Islamized but non-Arabized peoples, and therefore the majority of the world's Muslims, do not form part of the Arab World but comprise what is the geographically larger and diverse Muslim World.
From Wikipedia