Yeah.
And further thoughts on the subject: If I was a baker, I could not refuse service to a gay couple, because while I may object to gay marriage, I certainly cannot claim a legitimate religious objection.
If I did make a cake for them, I would go ahead and make a wonderful, delicious cake, because that's what being a professional means and despite my difference in opinion over gay stuff (mostly I object to hearing about it nonstop 24/7), they are both probably great people.