The Moral Argument for God

[Vincent]

1. How would you know that you have acted in an objectively moral way?
2. Who decides whether your behavior is "good"? You? Your friends and family?

I can't believe you're still trying to polish this turd of objective morality, my friend. 

1. Neither the billboard nor atheists say that they are acting in an objectively moral way. They only claim to be acting morally. Morally meaning, in accordance to the acceptable standards of morality present in one's society. 

2. The culture and society you live in decides whether your behavior is good. Derpaderp obviously. 

What if all of your friends and family are psychopathic killers who think you have done a good thing by robbing a liquor store without leaving any living witnesses?

 
The only reason you think that an immoral action is because you were raised in a society that taught it to be so. Why don't you visit and live in a third-world country for a while, where people don't have enough resources or wealth in their pockets to keep themselves alive and you'll soon see morality behind stealing. 

I think the reason billboards like this are being purchased is because atheists recognize that the Moral Argument is one that they cannot really refute.

Most intelligent people understand that when we say "morality" we mean "our society's morality" or else, subjective morality. Seriously fam, let this objective shit go. Name one objective moral that exists, and I'll prove it to be subjective by definition. Morality itself is a subjective concept. Thus anything created under it is inherently subjective.