Just to give you one more data point, I also had a problem with those last questions. Technically, I could say I go to church less often than once a month, since "never" falls into that category. On the other hand, the wording on that question does seem to assume that the survey-taker is a churchgoer. So I was left wondering whether to answer, or just abandon the attempt.
Unless you want to limit your survey to churchgoers, you might want to modify/ clarify it. You may be losing potential survey participants.