This week's Beyond Belief comes from Scotland, where the Scottish government is considering legalising same sex marriage. A period of public consultation has provoked a huge response from many religious groups who are opposed, yet the opinion polls are generally in favour. Civil partnership ceremonies have been legal in Scotland since 2005 and include the possibility of a religious blessing afterwards. So why is there a need for this further step? What is marriage? Is it a human or a divine institution? And would such a law, if passed, lead to moral anarchy, as some have claimed?