They are actually Persians, Aryans, not so much. That fact will be lost on most that don’t know history. Getting rid of Islum in Persia would be quite a feat.
Recheck your history. Persian (farsi) is an Indo-European language. The Persians were one branch of the Aryan migration into what is now Iran and India. In fact, the word "Iran" is derived from the word Aryan. Granted, there may have been some mixing with Arabs after the Persians were conquered by Islam, just as there is a lot of Norman blood in those who call themselves English. But they remain Persian in culture and outlook, and do not like it when those who don't know history call them Arab.