Today is the Queen’s birthday, or to give her one of her fuller titles, “Queen Elizabeth the Second, by the Grace of God, Queen of this Realm and of Her other Realms and Territories, Head of the Commonwealth, Defender of the Faith”. Most of us, however, would rather keep the full spiritual element of the royal family to one side, British people being famously reticent about matters of religion, as they are about any public displays of belief. That is what has always struck me about campaigning atheists, who seem filled with a rather un-English enthusiasm (as people used to say) about religion, or in this case against it. Today a group of them have a letter in the Telegraph condemning David Cameron for calling Britain a “Christian country”. They write: