Zoroastrian settlers in Western countries are turning more and more to reformation. The Zarathushtrian Assembly was formed in Los Angeles in 1990 to restore the religion to its pristine purity and to meet the increasing demand of those who want to choose the Good Religion, the first universal religion. The Assembly follows the pristine pure Gathic Guidance. For them, only a person born of Zoroastrian parents is Zoroastrian because they believe that religion is pre-destined by God. Some of them now accept a child born of Zoroastrian father and non-Zoroastrian mother.
Some reformists accept a child born of Zoroastrian mother and non-Zoroastrian father.
Others accept converts from any religion or belief. However, none of the reformist schools are active missionaries. The Zarathushtrian Assembly follows the Good Religion of Zarathushtra, the first and foremost missionary religion on historical record. It has dwindled to a minute minority because of the lack of its inherent missionary zeal.