I strongly disagree with this ! how much each year IRANIANS pay to go to Haj ? how many religious holidays we have? and I am not sure what you mean by we are the only Nation ???? Arabs / Islam attacked Spain, south of spain, and later were removed out of country... thats just 1 example ...
We have WAAAAAAAAAAY bigger problems than the name of a sea !!!
I rather we call it Arabian Gulf but our people live as rich as people in Dubai and Saudi ...
Spain had the backing of Europeans and it took them over 600 years and there are still many reminders of Arab presence there... Names like Gibraltar, Benalmedina, Alhambra and so many more.
We on the other hand were and are right at their door step and had to do it on our own, just look how nations like Egypt, Libya, Lebanon, Algeria, morroco lost their identity completely and became Arab while we did not and even made our own version of the religion imposed on us.
As I said the battle of culture is not over and will carry on as long as it takes, it may not happen in our life time or our children or grand children or their grand children but eventually it will.
What would you have told Ferdosi if you lived in his era and his struggle?