That is not our place to judge the bakery owners. I do not know if they hate, I would be much more inclined to say they disagree with marriage being between two men or two women instead of a man and woman, which God talks about. They have the right to disagree.  Just like it is people's right to disagree with the death penalty. 

For me personally some of my dearest most treasured friends are gay. I am also a Christian. And I am not gay. And for me, it is like so what. They are my friends, period.