I got in this discussion a little late and had a few points to add with respect to this discussion. Justin sort of touched on it. I agree that is not worthy of Orthodoxy to be racist. Maybe you could disuss this with your Priest and parents together.
My biggest concern, however, when I hear this sort of discussion is that the person is of another faith. Two examples, if I may....
My first cousin, married a RC Polish guy (she is Serbian Orthodox). They decided to get married in a non-denominational Church (I think United), so as not to offend anyone. Turned out that decision just offended both sides.
However, when push came to shove, she caved and Baptized her 2 kids in the RC Church. I was very upset. Years later, her "staunch" RC husband was having an affair with a family friend (coincidentally also RC). A bitter divorce ensued and she got "legal" authority over the kids.
As legal guardian, she chose to convert them to Orthodoxy (our Priest said kids couldn't be "re-Christened", although I have since read differing views on this). My question to her was "why she was so willing to give up Orthodoxy, for a guy who didn't give a darn about religion?" I have seen this happen to many who marry outside our faith.
My sister. Married a Newfy (for those who don't know, that means a Canadian from Newfoundland). My brother-in-law's sister is fervently RC, always passing judgment over our family and the inferiority of our faith.
My sister told her hubby that marrying her meant, converting and practicing our faith. Turned out, he was never Christened so it was like a scene out of My Big Fat Greek Wedding. He was Christened in our Church. Their two kids are Serbian Orthodox. They both go to Sunday School, in Church.
At first, my parents weren't crazy about a "non-Serb", but once the religious questions were dealt with, everything else was okay. In short, my folks wouldn't trade their son-in-law for any Serb.
So the moral of this long winded story, is that you have to show your parents that you can preserve all the beauty and traditions that come with being an Arab, still holding true to your faith and culture. I think this can be done, so long as your partner alwasy respects your Arabic traditions, as you should respect her Persian ones.
As long as you keep your faith, your ethnicity should be secondary.