We needn't structure our laws around a few nutters here and there, who for whatever reason, incorrectly believe that a wedding, by definition, has to be a religious ceremony. That's just a flatly absurd suggestion.
Please explain why anyone should be compelled, under penalty of law, to participate in someone else's wedding ceremony, religious, civil or whatever.
No one is compelled to do anything, but if you go into a certain business, there are rules you must follow. Not being discriminatory is one of them (or well in this case should be). If you want to be discriminatory in your personal life have at it. If you can't put your hate aside to not be discriminatory in business, well no one is forcing you or compelling you to go into the business.