I think you and I have different definitions of "christian household" professor and the ability to categorise different religions.
Vlad - I think most people will understand what is meant by a christian upbringing.
My understanding is that the BSA survey uses a face to face approach where those participating in the survey answer a set of questions. The one for upbringing is:
'In what religion, if any, were you brought up?'So the response is largely self defined, but the researchers are able to probe to understand a little more if necessary. Now I don't know what their structured probes might be, but presumably they may ask about elements of upbringing that might be considered to form part of a religious upbringing. The most obvious would be.
1. Did your parents choose a formal initiation ceremony into a particular religion (e.g. baptism for christians).
2. Did you complete any further initiation events (e.g. first communion, confirmation for christians)
3. Did you attend voluntary extra-curricular religious instruction classes as a child (e.g. Sunday school for christians).
4. Did you attend religious worship as a child, outside of special occasions as weddings, funerals and baptisms or as a requirement from schooling.
5. Did your parents choose to send you to a school with a particular religious faith ethos where this was a reasonable choice (i.e. available locally and non fee paying).
Now perhaps Vlad will just claim that these were all societally and culturally expected aspects of any upbringing back in the day and therefore nothing that signifies a specifically religious upbringing. But he'd be wrong. I'd accept that 1 was societally and culturally the norm back when I and Vlad were kids. But none of the others were. Most parents in the 50s, 60s and more recently did not choose 2-5 on my list for their children. This is what parents did who wanted a religious/christian upbringing for their child.