Tell me the who penned the book of Romans and you'll realize you're wrong. It was Paul by the way, not God who said these things, whom also persecuted Jesus' ministry at first before beginning his righteous journey. There is a path from sin as God knows what's in your heart. So it is of no consequence what someone's sexuality is in my opinion. 

In regard to the article: I think the point of this petition is to dually respect business owners' beliefs and not force them to participate. A Roman Catholic for instance, may find it difficult to abide this human law over their beliefs and that not should be the case. If they are more comfortable with sacrificing customers then so be it. It's not as if same-sex couples won't find someone to make a cake for them, or any other services they may be request of business'. Business' will suffer the revenue loss, while others who are accepting will flourish and we should let that equilibrium take place imho.