Dude you lost the debate with your first ignorant statement "Iranians willingly converted to Islam".
Heh, let's recap; you:
1.) Confused Persia's ethnic and religious demographics.
2.) Made the ridiculous assertion that the Islamic invasion killed everyone and destroyed everything only to later argue directly against that.
3.) Confused invasion with forced conversion.
4.) Didn't know that the Persian language was used in administration in the region under Arab rule.
5.) Didn't know that the military forces were housed in garrison towns and not in civilian towns.
6.) Admitted to having never even read a single book on Islamic history
7.) Argued against your own sources
8.) Chickened out when it came to the formal debate and ban bet challenge
9.) Didn't even know about Orientalists.
You're not performing very strongly here, and the desperation showed itself all the more strongly when you tried to accuse me of being a secret Muslim.