If we want to protect and preserve British traditional culture and values, we cannot do it without Christianity. Not only has Christianity been part of them since time immemorial but also they couldn't continue their existence without it.
An anecdote. I was in Steyning, in Sussex, in the Downs, not far from the sea. Our car had broken down. It's a beautiful village (or perhaps a small town now) in the South-East of England, the constituency that my party Liberty GB has chosen for the 2014 Euro Elections. Without enrichers in sight - except for one very kind black bloke who offered to help -, it looked like England may have been pre-enrichment. Very well preserved, with lovely Tudor houses, quaint, there was a building covered in Union Jacks and portraits of the Queen, you've got the idea. Every time we asked the locals for directions to the centre of the village, they directed us to the church.
The question about atheism and religion is simple. Individuals can be atheist, societies cannot. Atheists can be upright, moral individuals. But most people who follow the idea of a Godless world end up behaving in unethical ways, like irresponsibly having children out of wedlock they cannot provide for; treating their sexual life as a drug or alcohol (which they may also be addicted to); repeatedly having late-term abortions which more and more resemble infanticides; becoming addicted to consumerism and material things - kindly called "shopaholics" - to fill their empty lives and ending up with debts they cannot repay; neglecting their elderly parents; putting other people's and their own health at risk with promiscuous heterosexual or homosexual sex; and committing crimes. These people may not necessarily call themselves "atheist", but they have abandoned a moral system which for them would in the past have been dependent on the idea of God.
Think of this. If prisons, punishments and the penal system were abolished tomorrow, there are people who would continue to act more or less in the same way as before. But do you really believe that all members of society would?
There are many who, either because of limited intelligence or other factors - emotional, for example - don't live an ethical life without something guiding them from the outside (a condition that the Enlightenment philosopher Immanuel Kant called "heteronomy").
You may ask: what about those atheists who are behaving morally?
There is a risk in that too. A risk of erosion. The majority of atheists or agnostics among us have parents who believed in God, or grandparents, and so on. We have been educated in a Christian or Jewish way which has influenced our outlook, even if this can go back a few generations. But over time those values will become more and more diluted in people and therefore in the education they impart to their children. Gradually, maybe slowly, they will weaken or even disappear.
British culture has its roots in Christianity. It is its breeding ground.
Christianity has a solid rational basis. It has been studied and systematised by philosophers, first in the Middle Ages with the Patristic and Scholastic movements. It has incorporated Aristotelian logic. People like Dawkins or Christopher Hitchens who tell you otherwise are zoologists or journalists, not philosophers of religion, not even philosophers of science. They have no in-depth knowledge or understanding of this subject. If we lose Christianity, we end up believing in all sorts of superstitions, as it's already happening with the increase in the number of people who believe in astrology, spiritualism, all sorts of cults, New Age doctrines, "alternative" medicine, and so on.
And also, let's not forget that reason has its limits. It is rational to understand that reason is not everything.
No society has ever been without religion. If we lose Christianity, we will fall prey to other, much worse, religions or pseudo-religions, like, um, let me think, Islam for instance.