my inclination is say that businesses should have discretion in what clients they decide to serve
the thing that bothers me is the idea that businesses could potentially have complete discretion to legally discriminate and that's not cool. if all you have to do is say "i'm religiously compelled to not serve you," that's a pretty stuffty law and could affect more than just gay weddings. in that case i'm sure you would easily win in court tho since that's legitimate, intentional discrimination
also ofc that it would suck to have someone tell you to forget off cus they don't like gay marriage but idk which is more important. i don't buy the whole "gay marriage is discrimination against religion" thing but i certainly think private businesses have more rights than public institutions