Hmm, what if they refused to bake cakes for couples that weren't having Christian ceremonies (and so would be living in sin in the eyes of the Christian god)?
Something tells me that few business owners would refuse to cater to any group that was a substantial enough part of the population that doing so would result in a significant loss of revenue, however. If they did, they wouldn't be in business for long.
That's really the thing: they can afford to discriminate against people who are members of very small minority groups within their community. And unlike remarriages, or non Christian ceremonies, same-sex weddings are would be obvious to the cake makers, assuming the couple asks for two male or two female names to be written on top of the cake.
