We know whats coming, its only a matter of time before some couple decides to sue a church for refusing to officiate their wedding. And if it goes before some muh feels judge, they will have their way.
That seems like a reasonable fear, given all the lawsuits brought by cohabitating couples and couples from outside the denomination that various churches have refused to wed.
There's no way a homosexual couple would win that lawsuit. And even if they did, they'd lose on appeals. It infringes on religious liberties.
Frankly I think a much stickier issue is the peripherals surrounding a wedding: photography, baking, etc. I think a good compromise is that if your services require you to attend the wedding (photography, catering, etc.), you should have a right to choose whom to serve or work with. If not (like cake decoration), then you just need to bite your tongue and do it.