You're right, but it does note the non-religious, as do the following links. Do you have any sources that could help contribute?
http://www.jewishjournal.com/iranianamericanjews/item/video_persian_new_year_unites_folks_of_different_religions_together
http://forums.randi.org/showthread.php?t=236855
http://www.iasaz.org/
https://en.wikipedia.org/wiki/File:IAmericanreligions.png
http://www.niacouncil.org/site/PageServer?pagename=Resources_iranian_american_scholarships
http://iaca-seattle.org/