That's why I'm pondering the necessity of introducing at our church a policy prohibiting the use of church property for a so-called "gay marriage" or related event (bridal shower, etc.), so at least our position would be clear in advance of any government action.
This news story from August discusses the issue of establishing such church policies.
Nothing will stop the government for forcing churches to comply.
A church refuses to host anything for homosexuals, the government will declare it a "public accommodation" which means they cannot refuse
A church says they will only host things for members, the government will force the church to allow homosexuals to be members
A church refuses to perform any weddings, some homosexuals will sue anyway, and the government will force them to do said weddings.
The homosexual mafia and their liberal allies will not be happy until they have eradicated all but the apostate churches from the US.