So what happens when, after much soul-searching, you find a religious whose message resonates, only to find they're not accepting new members? That's what happened to Joseph Peterson, who discovers after years of private devotion that the faith he aspired to didn't want him- even though the faith's dwindling numbers may doom it to extinction. To be a Zoroastrian, one must have a Zoroastrian father, and to remain so, one must not marry outside the faith. Zoraostrianism's strict anti-conversion rules, established to appease Indian rulers two thousand years ago, are now a matter of doctrine, and although there are many Zoroastrians who wish to accept converts, the majority, it seems, would rather allow the world's oldest revealed religion go extinct than to accept outsiders.

See also: Will the fire go out?

A Small but Mighty Religion; What we Believe