American law is not sharia law. So your strawman does not hunt.
A judge may have many activities, marriage appears to be an activity some are expected to do. However there has been a fundamental change to marriage now. Thus the activity is different. Thus, our employees that perform said activities deserve the option of opting out on religious grounds. It is not justified to add a new task to job then fire someone that refuses to do the new task based on religious grounds. You will loose this one. You can force new judges to do the task by putting it on the job requirements and having them sign up for it in order to take the job, but you can't fire people cause they don't want to do this task.
American law is also not Christian law. There was no strawman.
If a law changes people don't have to follow the law? Are you being serious? If the city my business is in decides I have to put in a wheelchair ramp I don't have to do it because it is a new law? LMAO
I think what the judge should do is express to a potential couple that he has reservations about marrying them and if they agree, he will bring in another judge to perform the ceremony and pay the other judge out of his own pocket. If the couple doesn't agree, tough titties.