Why would you think they were being uncooperative? If I am having around 15 people over to my house weekly for dinner and a Bible study and a code enforcement officer asks me what religion I belong to or what we are doing, I would reply by questioning the relevance of his questions. Again, if the report is accurate as to the questions asked, how could those questions be relevant in any code enforcement context?
According to reports, this group met in that home for five years without complaint. You are likely correct and this warning would never had been given had there not been a complaint.
Why are her assumptions any more ridiculous than the assumptions made by others on this thread? You know, I don't know any "poor me Christians" and I don't know that I have ever met one. They must exist because I see people post about them and there must be a lot of them because, according to some, Christians are playing the victim all of the time. It must really be huge somewhere.