The cake ain't gay. But rights overlap. Religious rights are in the famous Bill. There are others there as well.
But forget that.
I'm with the Christians on this, though I don't like their idea of morality. If you have a quirky belief, you shouldn't be made to create cake art for folks who don't believe it.
It's not that it isn't offensive to deny your cake art to a gay couple. But who needs lawyers defining whether a Christian cake-maker can make a gay cake. There are going to be little situations like this in a free country. You don't need a court to settle everything. Force a cake-maker to bake a cake he doesn't want to and you are not removing the issue: you just internalise the cake-maker's rage. And make all Christians feel like victims of the gay lobby.
Go and find a cake-maker who wants your business.
http://www.huffingtonpost.com/entry/trump-justice-department-gay-wedding-cake_us_59b1af6fe4b0dfaafcf69ee6?ncid=inblnkushpmg00000009