When David Cameron talks about "we Christians" at a Downing Street reception, almost the last explanation that would occur to anyone is that he is being sincere. Yet this can't be entirely discounted. He has been a regular church attender in his London life. But so was Tony Blair, at different churches, and he wouldn't talk about his faith until after he had lost power. So something political must have changed as well.

One obvious explanation is that Cameron's "big society" was itself an idea informed by Christianity. In part this was because the churches and the voluntary sector were meant to deliver some of the services that the state no longer does.

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