If his religious beliefs called for the killing of all homosexuals and either the death or subjugation of all non-believers, and if there was an ongoing history of people from his home town that had a 14 century history of doing just that and attacking innocent people to slaughter them based on these tenets, than to show him any disrespect or insult or offend him in anyway that there was any defect in his religious views would be vulgar, bigoted, and even fascist or nazi-like behavior.
BUT, since his religion is mostly about love and respect for all people, and maintains gay unions are not really marriages, so although he will not tell people how to live their lives and will treat everyone with respect he does not want to participate in hosting a gay wedding because he thinks it is a sham by its nature...he must be shunned and legally barred form participating in the Farmer's market.
BUMP to your pithy and accurate observation on “the state of the law.”