Oh for heaven's sake, OutragedFromLeeds, the Christian church believes that marriage is between a man and a woman.
End of story; they're not denying anybody's legal rights by doing this, gay people can still get married in the eyes of the law. If any government appointed official like a registrar in a register office refused to marry a gay couple, I'd think they should be disciplined.
Let them ( the C of E) hold that view; let anybody hold whatever view they wish, if people don't like it, just don't go to church.