How is it the goal to promote a single ideology? The petition could he utilized by many religions who seek to merely decline a service if it is not in congruence with their faith? 

I can't walk into a shop and expect someone to make me a suit with David's star on it or walk in wearing a shirt proclaiming love for satan. If i make my values known, you're seeking acceptance appeasement of the business owner. They can't be forced to accept. The reverse is true too. A Christian asking a Jewish shop for a crucifix embroidery with the word "messiah"...never ever happen. And Christian's expect this in respect of their devoteness to faith. In the end it is the owner's right and rightfully so.