I similarly thought of churches who do not wish to marry gay people will have to stop marrying just anybody who turns up at their door. They will have to revert to only marrying people in good standing within the church - this means they would need to be regular attendees and hold true to the stated beliefs of that church. For too long anyway have many young couples used the church as a nice photo back drop for their particular nuptials without being even associated with the church.
You make a good point. Many couples get married at the church of the parents of the bride or groom. This can often be a church that the child has not attended recently or ever.
As then, one or both of the couple is not a member, how can a church refuse to serve another “couple” that just shows up.
Gay weddings all around, for everyone. Its just a fun time. < /snark >