Accept the Bride and Groom. Look at the beautiful lives they are leading. Helping others. Pray for them, and their marriage. So often, in my experience, people reject God when they see others practicing intolerance in the name of God. Demonstrate that God is Love. I suspect they already know you feel disappointment. Pray for them. With luck they will come to know God. In the meantime, remember your daughter is not being a hypocrite - getting married in a church solely to please family. And Pray silently.