The homo lobby has had their fit and insisted that marriage is not religious....but that's not going to stop people from seeing it as a sacrament.
And as such, their right to abstain from participation in events that make a mockery of it is protected. They object and refrain from participating on religious grounds.
And yes, that includes business owners, doctors, florists, bakers, priests, cops. Just because they work does not mean they can be forced to participate in what they see as sacrilege, unless they are actually inflicting HARM to someone by their abstinence. And that is NOT the case here. Nobody is going to die because the homos need to get bakers who have no religious objection to their nuptials. There are lots of bakers who would jump at the chance to make a penis-shaped cake, and have to shove the staggering queens out of the way to get the cake to the table...there are lots of queer florists who revel in the chance to drape garlands around the necks of nude statues. Nobody's hurting you if they just say no.