Section 20 of the UK census asks respondents to specify their religion. The tick-box options cover ‘no religion’ as well as Christianity, Judaism, Buddhism, Sikhism, Islam and Hinduism; it also includes a space for ‘any other religion’. In the last census, in 2001, the space was hijacked by 400,000 self-professed adherents of Jediism and the odd Pastafarian – so-called ‘fictional’ religions. This time, secularists have been urging respondents not to do this, because the results would overstate levels of religiosity in the population at large. Of course, it is a nice question what a ‘fictional’ religion is: after all, one way to distinguish religious from non-religious people is by asking them whether they regard ‘non-fictional religion’ as an empty category.