What island group and church is this?
By the way, "Nguyen" (with a g) is an extremely common Vietnamese name; it's like Smith here, only much more common. If you go through a list of people and find someone named Nguyen, it really doesn't suggest any connection at all with Kathy Nguyen, because there is such a large number of Nguyens. It just means there's a Vietnamese person on your list.
I think if you take any random list of Vietnamese, you'll probably find that maybe 1/4 of them or so are named Nguyen. For example, I found (through a quick search for any organization of Vietnamese, there's no particular reason for choosing this one) the Vietnamese Professional Society. Three of the 12 members of its Board of Directors are named Nguyen. Link: Vietnamese Professional Society Board of Directors.
I don't remember the full story. It was on one of the old ongoing 'Nuygen anthrax' threads etc. As I remember,....it was a weird, small, informal, prayer/study/social group.........calling itself a church.....maybe just another NYC cult.......