I think we're actually in agreement, lorelai. I think
. I can't claim to know what the OP means by cultural Christian, hell I barely know what I mean on here sometimes.
For example my Mum (would identify as Catholic), my Dad (agnostic), sister (atheist), other sister (agnostic), DP (atheist), Nan (Catholic) and I (agnostic) all pretty much partake in the same practices when it comes to Christmas, Easter etc. We all attend mass equally frequently (weddings, funerals, and family memorial masses). So which of us are cultural Catholics, and which aren't? My sisters would be fine with being labelled cultural Catholics, my DP would resent being labelled as being connected to any religion.
I think, if there is a need to describe how I live my life, 'cultural Catholic' would probably pretty aptly describe it. I have no need for such a label, but understand that the OP and others might like it to describe their participation in certain religious traditions, despite not being religious.