Well, unless the neo-Nazi cake was saying " Happy birthday Nick Griffin", it would be promoting hate speech, which is against the law. I would imagine that atheist cake shops the world over produce cakes to order with religious symbolism without demur. Or just differently-religious cake shops. Have you got examples of this having been an issue? What kind of hateful wedding songs have you in mind and are you talking about a hired performer here? The thing about the cake shop in question is that it was discriminating against a particular section of the community that has suffered discrimination for way too long, a fact that the law recognises. That is the focus of this issue. Suppose I was renting out a flat and I refused to let it to a black family because I don't like black people or think they would degrade the neighbourhood. Well, the flat is my business enterprise and I should be able to do what I like with it. Right?