Christian hoteliers appeal against ban on gay couple

This story is about a Christian couple who decide they only want to allow married couples to stay in their hotel. Now, I don’t want to discuss the merits of whether they should or shouldn’t, no I want to ask the courts about hypocrisy? When people enter a court to make a statement, they are asked to place their hand on a Bible and to swear to tell the truth, etc….

So why is it that the book the courts consider so important they ask people to swear by have no relevance when talking about the contents of the book?