They are "read" by a computer anyway, so what you put in in is immaterial. For religion I put in JEDI, which I did 10 years ago, believing that if enough people put the same, it will be an option on the next census form. Load of bollox as it didn't happen after an internet campaign back then.
Bit worried though as I did mine and dated it a week before I should have. Hey ho, there you go.
Cheers, D.