I would sell a cake to them in a heartbeat. Money money money. If it said death to infidels... I would not. Now turn your moral compass to what these folk believe (rightly or wrongly) and you have same dilemma. To them it is wrong... they are a private, not a public business (like the woman who refused to grant marriage licences)....
I just think it is bullying of Christians by gay people here. Yes, I did say that. There must have been so many bakeries who would have done the cake gladly yet they sued the one that did not. Why? To make a point? Bullshit. To show them they can get what they want. I have entered a store and been treated as a lesser person than someone in a suit when i had €1,000 in my pocket to spend on a suit. I left store went to a different shop and was treated well and bought my suit there. I won, that shop won, idiot first shop lost. Great.
I've done the same as you many times when shopping. I expect good service, when I don't get it, I go elsewhere to shop. If I were marrying another guy and was refused a cake because of this, I would consider that bad service and move on. Most often the bride and groom pick the cake together. If a groom and groom or the bride and bride did this, it would be obvious to the baker that it was a same sex marriage from the start.
A new law went into effect today in Oregon relating to same-sex marriage: The words "husband and wife" will no longer appear in state marriage statutes. They'll be replaced with "spouses in a legal marriage."
The part that is not mentioned is timing. When ordering a wedding cake it must be done with some advance notice. This was not the first time the women had been at the bakery. I don't remember if they'd already ordered the cake and were refused it at the time of pickup or there otherwise was not enough time to go elsewhere.
I have little doubt that these women intended to cause a ruckus by hollering illegal discrimination. The fact that they accepted money from the baker makes me wonder if they weren't opportunist. I'm presuming the women kept the money. If they'd donated it, it would have been better and their complaint seemed more legitimate.