Christian leaders go marching as to war today, aiming to put their stamp on the debate about the role of religion in modern public life.

The Archbishop of Canterbury, Dr Rowan Williams, and the Roman Catholic Archbishop of Westminster, Cardinal Cormac Murphy-O’Connor, are introducing a new think-tank report that challenges the secular dream of taking Christ out of Christmas or anything else.

Among the report’s targets are “the annual rash of winterval stories” about councils that try to rename Christmas as part of a trend towards politically correct public symbolism that ends up as “insipid and uninspiring”.

The report comes as the Royal Mail eschews religious imagery on its Christmas stamps, which go on sale today. The stamps feature Santa Claus, a reindeer, snowmen and a Christmas tree. The Church of England said that it “regretted” the omission of a Christian theme.

The new think-tank, Theos, named after the Greek word for God, issues its report, Doing God: A Future for Faith in the Public Square, at a time of controversy over the role of religion. The past few weeks have seen rows over faith schools and Muslim veils, a British Airways employee fighting for her right to wear a cross and the atheist scientist Richard Dawkins entering the bestseller lists with his book The God Delusion.

The heads of British Anglicans and Roman Catholics argue that British society is experiencing a “moment of perplexity” when new questions are being asked about the place of religion in public life and debate.

“Issues of belief and faith, of how human beings experience the world, have rarely been so important in a society, or so badly misunderstood,” they say. In a joint foreword, they welcome the conclusion of the report that faith is not just important for human flourishing, but that society can only flourish if faith is “given space” to contribute and challenge.

“Many secularist commentators argue that the growing role of faith in society represents a dangerous development,” the archbishops say. “However, they fail to recognise that public atheism is itself an intolerant faith position. If we pay attention to what is actually happening in the United Kingdom and beyond, we will see that religiously inspired public engagement need not be sectarian, and can in fact be radically inclusive.”

The report by Nick Spencer, a researcher and writer on religious trends, takes its title from the comment by Tony Blair’s former press officer, Alistair Campbell: “We don’t do God.” The report argues against confining faith to the private sphere, and says that religion will play an increasingly significant role because of the return of civil society, research about the role it plays in happiness and the politics of identity.

Mr Spencer also says that faith is the answer to consumerism, or what he describes as “chequebook citizenship”. He advises public figures to take care if introducing God into debate and to make sure that they are not doing so for personal or divisive reasons.

But he adds: “We should not react with bewilderment when a public figure does ‘do God’. We should be less scared of public figures citing religious texts in mainstream contexts. We should be more willing to treat other value systems as coherent, reasonable and even valuable rather than as primitive or grotesque mutations of the liberal humanism to which every sane person adheres.”

The comments drew rapid fire from the National Secular Society, whose vice-president, Terry Sanderson, said: “This report is self-serving, self-deluding and a recommendation for the imposition of a new authoritarianism on an unwilling population. The idea that religion should play an even bigger part in the public arena than it does already is one that will bring a backlash. The British public does not want its life to be dictated by religious institutions, which it sees as nasty, small-minded and controlling.

“Atheists or secularists may ask questions that archbishops would prefer not to hear, but religious intolerance in Britain, especially over freedom of speech, comes almost exclusively from Christian evangelicals and minority faiths.”

The Royal Mail said that Christmas stamp designs alternate between religious and non-religious every year. Last year’s set included a controversial image of a man and a woman with Hindu markings worshipping the infant Christ.

SECULARISM ON THE MARCH

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