How is anyone going to be "forced to participate in a gay wedding"? The gay mafia going to shotgun you into attending weddings?
No, his royal majesty, Barack Hussein Obama II - Emperor of all the Americas, anointed above all gods, creator of the Universe, cum guzzler and turd burglar, will send his the personal henchmen, the IRS, to punish any who defy the royal decree of the GLORIOUS PEOPLES JUDGES who have made this law.
It's not like anyone wants a law that says photographers have to go to gay weddings and perform photography services. No one wants that. Or, bake same sex wedding cakes, or deliver flower arrangements. No. Not at all. There is nothing that shotguns anyone into participating.