for Shiaizing the Iranian people from Sunnism, Zoroastrianism, Christianism and other religions.

In Iran there are many religions. Each has its own name for its places of worship.

e.g.

Islamic - mosque

Jewish -synagogue

Christian - church

Because it is a written law in Iranian Constitution. Any foreign woman married to a man who is an Iranian citizen, will automatically receive Iranian citizenship- whether you want it or not. They not required to renounce their foreign nationality. However, they are recognized only as Iranian based on Iranian government point of view.
You should then apply for an Iranian certificate of identity, a national ID card and an Iranian passport.

No.

The Iranian government changed the first year of the Iranian solar calendar from the Islamic hijri to the ascension to the throne by Cyrus the Great.