It is so unfortunate that the Presbyterian church is doing this, but it is not the only denomination that has turned away from God's Word to lend support to the abominable practice of homosexuality. Many, many religious leaders of various denominations have bowed down to baal by either choosing to be nebulous in their statements or blatantly supportive of this particular sin. I do believe that more of this will happen. I also believe that those who are bloodthirsty to persecute Christians (so they can mock our God in whom they don't believe) will use this awful Presbyterian example as a precedent to legally force other churches to follow suit. Here's the good part: God will not be mocked! Those who mislead God's people, His flock, will answer to God and will be punished. God will always make a way for His people to serve, worship, and obey Him. God will not allow His people to be forced to violate His Word.
Christians need to rely fully on God and refuse to give in to the fear that the world intends to impose. So what if they call us names? So what if they threaten to sue us for not wanting to support same sex marriages/weddings? So what if they tell us the one and only God is not real? Didn't God's Word already warn us of these happenings? I know in real practice that enduring these things is not easy, but God never said it would be. He simply tells us to depend on Him.