Yes, I saw that. It simply emphasises to me the problems that Christianity faces, and what a confusing state of flux Christianity seems to be in, at least in this country.
Why is this a problem for Christianity yet not a problem of history education?
The poll suggests that 40% of people didn't realise that Jesus was a real person(assuming, of course, that he was) so the Christian message doesn't really seem to be very successful, does it? Also, although 57% classified themselves as Christian, fewer than 10% actually go to church. So, I assume from the article, that the CofE at least isn't being particularly successful in holding on to its adherents very well. I see this as a problem for Christianity in this country, unless you think that they are happy with this situation, of course.
The point about history education is a much wider point, and, yes, I think that there could well be problems with both the understanding and knowledge of history as it is taught in schools
I'm not really sure what the relevance of the thread title is to this survey, though?