I dunno about that, Daffy. Although there are a fair few on AB and other online sites, I still don't get the feeling that there are massive numbers of us.
At school age I would probably have said I was "CofE", although that would have been a guess as the family weren't churchgoers. RE classes opened my eyes to the smorgasbord of available faiths but my sense of logic told me that, if there's no agreement between them, then it's highly likely that they're all wrong. Bad RE, bad.
@Sveyk
I think the lily-liveredness comes from the fact that most employers have equal opportunities policies in place and outspokenness will get you sacked. Whatever is going on inside people's heads, they're forced to keep schtum. (sp?)
Or, as one colleague was fond of saying, "Oops, thought Police" :D