Let's make that argument for blacks now (or Jews?). Or is it just okay just to limit options for gays or maybe just gays getting married?
What are your limits for allowed discrimination?
Help me out here. Can you provide me with a scenario in which a person's first amendment right to practice their religious beliefs is in conflict with statutes around non-discrimination on the basis of skin color or ethnicity?
This is what seems to be consistently glossed over in this discussion. This isn't just a blanket "to discriminate or not" situation. We're taking about a conflict of rights here. On the one hand is the right of people to not be discriminated against on the basis of their innate characteristics. On the other hand is the right of people to practice their religion and to express their beliefs without interference.
In this (fictional) case, the conflict is explicit, and is the entire basis of the case itself. If this were a baker who made custom birthday cakes, and they refused to make a birthday cake for a gay guy, that would be an entirely different situation, and I would 100% object to the baker being allowed to do so, even for a custom cake. I would object, because birthdays have nothing at all to do with sexual orientation, and there is no religious guideline against birthdays for gay people. Similarly, if the baker made custom wedding cakes, and refused to make a birthday cake for a black couple, I would object - there is no religious guideline prohibiting the marriage of people on the basis of melanin content.
In this specific case, however, there IS a conflict - even if it's one that I think is dumb. There IS a religious guideline against same-sex marriage. So we have a direct conflict between the baker's right to practice their religion free from interference, and the right of the (fictional) gay couple to get married.
At the end of the day, the gay couple does not need a cake in order to get married. They certainly don't need a custom cake. And they definitely don't need a custom cake from this particular baker. The baker's refusal to create a custom cake that violates his religious views does NOT create a barrier to the gay guys getting married, nor does it even create a reasonable barrier to the gay guys getting a wedding cake.
On the other hand, forcing this baker to create a cake for the gay couple's wedding directly forces him to violate his religious beliefs.
The closest parallel I have is the case years ago where Yaniv* sued a bunch of middle-eastern small business women who refused to wax his balls. He argued that because he identifies as transgender, and these businesses performed pubic waxing for women, they should be forced to wax his balls because transgender is a protected characteristic in Canada. On the other hand, the women were almost exclusively muslim women, whose religion prohibits them from handling the genitals of men other than their husbands in any way. In that situation I sided with the aestheticians. Forcing them to wax Yaniv's balls would be a direct violation of their right to religious observance; having waxed balls or not is not a fundamental requirement for Yaniv to be transgender; there are many other businesses that either specialize in the waxing of male genitals or which were willing to wax his balls. In that situation, Yaniv's desire to force females to handle his junk against their will and in violation of their beliefs was something I did not support - and neither did the Canadian court ultimately.
I have the same core position with this case. Off-the-Shelf wedding cakes are ubiquitously available; other custom wedding cakes that are happy to make same-sex cakes are easily available. Forcing this baker to make a gay wedding cake does not have any affect on gay rights as a whole, but it does violate the baker's rights.