I remember seeing that form of a friend about that long ago too Mari, it let you put 'none'; the one I filled out at my FI didn't have that option. I asked the recruiter & she told me to put 'something, what religion are your parents' so even though I personally don't have religion, I had to put Christian because there is not any more an option to put 'none', or atheist or whatever.
Hehe, it reminds me of a story in the news a few years ago in Australia, for the census, they had a space for religions not included on the form. People even put 'Jedi'!!! The next form, it only had tick boxes and one for "Other", but no space to write what it was...