I do wish the ACLU would get this uptight about people who want to exercise their second amendment rights. But alas, it's perfectly legal to refuse service to someone who carries.

That having been said: Does this bakery call the minister/pastor/priest of every heterosexual couple that comes in wanting a cake, to determine they are worthy? Have they saved themselves for marriage, or have they indulged - perhaps even been living together? Are they tithing the required 10%? Naturally, it would only bake cakes for first marriages. If the bakery is going to only bake cakes for couples who don't run afoul of their Christian values, one must assume that it at least hits the other high points in setting the bar. There's more to it than just homosexuality.