Naomi, I believe, like me, you are heterosexual, not religious and married? So what has religion got to do with your, or my, marriage? If you walked into a shop, say a jeweller, to buy something to celebrate your marriage - say an eternity ring with an inscription (to make it a personal service rather than simply a "product") - and the Christian jeweller refused to sell that service to you, on the basis that your marriage wasn't a "proper one", for some reason, e.g. you're not religious, didn't get married in church, haven't had children, didn't want children, couldn't have children, whatever ... what would you think about that? Would you feel affected in some way by that jeweller's religious beliefs? I certainly would.
The only difference between you, me and a married gay person in the above scenario is that they're gay. We're all legally not religious. We're all legally married. So why should they be treated any differently to you or me? Prejudice. That's all. Religion has nothing to do with you, me or them.
> Since the gay couple were very eager to protect their rights, they should, in my opinion, have had the courtesy to understand that the rights of other people are often equally important to them, and rather than making a fuss, shopped elsewhere.
Well they probably did shop elsewhere in the end, but as for not making a fuss ... why shouldn't they? They were being discriminated against. Why turn a blind eye to it? That only leads to more discrimination.