Sounds quite a bit different from the Canadian census question - which has been a bit controversial here:The question in the 2018 census was asked in an open ended manner. Participants were asked to indicate their religion in a blank space and given ample room to describe their faith. Check out page 71.
https://www.stats.govt.nz/assets/Reports/2018-census-design-of-forms/2018-Census-Design-of-forms.pdf
For more detailed results check out:
Religion in New Zealand - Wikipedia
What is this person's religion?
Indicate a specific denomination or religion even if this person is not currently a practising member of that group.
There's a "no religion" option, but the phrasing of the question seems to have led to an under-reporting of non-religious people in Canada.
This makes me wonder how much the apparent differences in religiosity from country to country are a result of differences in the questions being asked.