Such is David Cameron's lot, but there is no sense in denying that his background will count against him as a spokesman for the Union. His political allegiance, by contrast, is a matter of choice, and it would be equally foolish to deny that a pro-Union campaign seen as driven primarily by the Conservative Party would be counter-productive.
But despite that, and despite the fact that England has an established church, and that some of its bishops sit in the House of Lords, the notion that people in political life don't "do God" – as Alastair Campbell reminded Tony Blair – is not a particularly new one.