The minority religions only have small communities, mah. Not
enough local religious leaders to go around. In fact, I count six
among the ten officially-recognized ones: Jainism, Hinduism,
Judaism, Zoroastrianism, Sikhism & Baha'iism. Combined
together, they form less than 15% of the local religious population
(with Hindus taking a 4% share). Weigh that against the Big Four:
Christianity alone comprises about 11%, Islam 18%, with Buddhism
& Taoism the largest.
So it's good to have these representatives in attendance, though I
suspect the minority ones often don't really have anyone to
physically bless on the occasions. I remember them gracing my
brother's OCS commissioning parade back in 1986, so the ceremony
has been around for quite a long time.