I also heard on the radio (from a guy involved in the census stuff) that ultimately it's up to us whether we are a Jedi or not, I only put it for a laugh. He said it was up to us whether we considered ourselves to be a jedi or not.
The officials from the census made it clear that they were aware of peoples plans to enter Jedi as their religion, but were not going to be including Jedi as an option on the next census, which was the point of everyone doing it in the first place.