You can pretty much flip the bible open on a random page and if you manage by some stroke of luck to avoid some drug induced bar-stewardisation of greek or egyptian mythology, you will more than likely find some ethical stance that is highly contradictory with what most people in the UK think. On homosexuality, for example, or selling daughters into slavery, blasphemy, eating shellfish, working on the sabbath or if you happen to open a very early page, the mechanism for the whole damned thing; original sin and the required concept of inheritance of responsibility for all actions through a line of descent.
Besides, the question isnt even as simple as 'are the beliefs common with christianity', nor even 'are they derived from christianity', for us to be a 'christian nation' our perspectives and actions would have to be informed directly, no handwaving collective unconscious hypothesising, from the bible, for a majority of people. This is clearly not the case, no matter the stats on those that identify as christians. Even many people that go to church are basically modern secular in their beliefs. Many even make little to no attept to reconcile their actual beliefs and practices with their religions teachings. I know no numbers, though I'd like to, but we all know these people (or at least know of them). Its this complexity that a simple quesiton in a census of poll cant take into account, and so we dont really know how religious the UK is, but its pretty clear that strongly religious people, the sort that (kinda literally) consult the bible on what to have for dinner (or what not to) arent a significant majority.
I'm not sure that I agree or disagree with dawkins on that, and you/Mrs/Ms armstrong may well raise a valid point;it seems quite reasonable from the nesessarily massively stripped down version you present: I was just stating that that position has been presented by at least one highly visible atheist. i believe sam harris has argued similarly.
My view on it is tricky to me. I find it difficult to scorn a person for being factually errant in their views of the nature of reality. I have a physics degree, I know more about it than most, and I'm likely wrong about most of it (via most of modern science being likely wrong, or at the very least always ready to be). The specific claims are unimportant to me, its the methodology that counts: you seek the truth and never really care to find it, doubt all, be prepared for all to be wrong when new information or circumstances come to light. What religion has to say on that is fatally out of date, and my problem with it really is it fails to learn; it cant, since one text is enshrined as truth and only whatever tenuous interpretations you can contrive provide variability and change in your position. You dont see that with, say, Principia or On the Origin of Species;; pretty much thown out/rendered a limiting case and continually expanded and built on, respectively. It boils downt to semantics and framing persective with religion. How do we think this passage was intended, and what kind of translation are we going for? The flipside of that and a very significant danger, is that somewhat paradixically, we can engineer these supremely dogmatic guides on existance and behaviour to mean whatever the $% we want.
What really gets my goat is something that hitchens spoke very well on: the capacity for religion to make 'good' people do harm in the name of their religion, motivated ostensibly (perhaps simplisticly) by supernatural mumbo jumbo. Secondly, the defensive barrier that 'Religious Reasons' creates around anything whatsoever; even, to some, mass murder and genocide. Thats not on. Its ethically repugnant and its contradictory with free enquiry and speech.
But, the chaps that think more or less as I do, that try to be compassionate and often do a better job of it than I do, but do it because their imaginary friend told them to, or because they believe he/it did....I'm reluctant to lay into them. Even if they think daft shitee like the earth being 6000 years old. I'd rather you treat people well because of your beliefs than your beliefs be factually accurate and epistemologically sound. So I'm not terribly inclined to go after the moderates. I'm quite moderated with those I know. I jibe them a bit bit have little to no real ire or scorn for them.