How do I become an official member of the Jedi Religion?
I'm looking for something official, similarly to being able to become
ordaned online.  To clarify, I want to become an official member of
the Jedi religion; how do I do it?

There is no such thing.

http://en.wikipedia.org/wiki/Jedi_census_phenomenon

Classic !

Also a great link Nelson

You could declare yourself as a specific Sect, dedicated for example
to raising funds for victims of Acts of Vadar ... that would make it
hard for the PC not to recognize you.

I suggest that you ordain yourself, and invent a very small list of
Commandments, preferably rather ambiguous ones .. like :

1) Obey only the one commandment

If you can keep a straight face, you could have a lot of laughs