I think Randip's question is an important question for this reason. The Sikh community that visited with Rabbi Frohman do not represent the broad and diverse spectrum of those 20 to 25 million who are Sikhs.
For one thing GNNSJ are a "closed" community. By "closed" I do not mean they exclude others -- of course they accept people into their midst. But this acceptance is grounded on the GNNSJ way of practicing Sikhism, in terms of attire and worship which is uniquely GNNSJ.
More to the point, the author seems to see an analogy between orthodox Jews and orthodox Sikhs. The analogy is faulty. The closest one comes to an "orthodox" Sikh is to be amritdhari. And there the analogy falls apart completely. The honor of being amritdhari is to be part of a sangat where not everyone has taken khanda pahul, nor keeps the kakkars, and nor observes the Sikh Rehat Maryada in its totality. Their duty is to teach Sikhi through their actions and presence. Amritdhari are part and parcel of every Sikh congregation.
Congregations, or sangats, of orthodox Jews -- there are several different sects of orthodox Jews -- are also "closed." Orthodox Jews worship, live and raise their families in sangat. Often they live in religious communities, like the one described in the article. Reformed and conservative branches of Judaism worship within their own congregations. There is no mingling of orthodox, reformed and conservative congregations. Each has its own synagogues and there are important differences in the way Judaism is practiced. Conversions to Judaism are not even recognized by the state of Israel unless one has been converted by an orthodox rabbi.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/judaism/29567-sikh-delegation-meets-rabbi-froman.htmlReference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=29567
So this is not like Sikhism at all. I do not want to demean the basic message of the article. It tells an intriguing story. But an "orthodox" Sikh has yet to be defined.