Dear Zelhar,
I am a first generation American, and the daughter of Iranian Jews. I was born in Queens, and went to a yeshiva for first and most of second grade, after which, my family moved to Long Island. After that I began attending public schools. But my family belonged for many years to the only ashkenazic Orthodox Synagogue of the town, since there were so few Iranian Jews where we were. And I attended their after school program for years.
After 1976, most of the Jews in Iran came to America en masse, and to Long Island as well. So I would say that starting in the 80's and 90's, they started building Iranian Synagogues. My parents now belong to one as well. You should know that for Iranian Jews, there is no such thing as Orthodox, Conservative and Reform. The Iranian Synagogues I've been to however are kind of on the Orthodox side if I had to compare. And there are differences between your average Orthodox Jewish and your traditional Iranian Jewish services and customs, which could be the subject of an entire new thread.
But in terms of my faith/level of observance, I attend my family's Synagogue on Rosh Hashana. I fast on Yom Kippur, and have in the past attended a makeshift Iranian Synagogue close to where my family used to live. For this year, my sister had tickets from a friend to a nearby Conservative Synagogue which was within walking distance of her house. So we went there.
Now I'm not nearly as observant as many of the Jewish members here. However, I have NEVER, had any Christmas decorations at home growing up for Chanukah. Nor did I ever receive Chanukah presents. To their credit, Iranian Jews don't engage in that kind of thing. And I never intend to start if I one day have a family of my own. To me, those things are just for self-hating Jews who feel left out during the Christmas season.
I hope that answers your question. If not, ask me more stuff.