That's the no true scotsmen fallacy....if they say they are Christian then they are.
How do you propose we determine the arbiter for 'proper' Christian or not? Given that there's nothing particularly definitive about any of it, no reliable sources of information, no means to reliably test the proposition, how do we determine that any one claim is any more or less accurate than another?
How does 'real' Christian and 'fake' Christian differ from 'claims of Christianity of which I personally approve' and 'claims of Christianity of which I personally disapprove'?
Richard Dawkins and other secularists are running a campaign to get people who would habitually put C of E as their denomination to declare themselves as what they really are, agnostics and atheists, at the census.
I fail to see how this could be interpreted as a 'get out of jail free' card? Surely accurate census data is important; campaigning for an accurate description gives us more reliable data from which we can make better judgements on matters of public policy?
O.