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Same phenomenon happened with Zoroastrianism in the US in the 2000s (?), growing from around 6,000 adherents to 15,000.

Most of them came from Iran and India however…

Can you even become a Zoroastrian? I've always heard it's a religion that doesn't allow conversions.

Interesting, I didn't know that! I always assumed it was new-age trends increasing the number. Immigration makes more sense I guess.