>> we know the invisible magic man in the sky is a myth. >> they must be reading too much wick speed qua. >> reporter: when the catholic league saw the atheist billboard -- >> is there anybody going to respond, are we just going to accept this thing as a doormat? >> reporter: they put up their own billboard on the manhattan side. you know it's real. this season celebrate jesus. >> we know god is fake and we know christianity stole christmas. we know this. >> so they believe that we came from the big bang they're or is it the king kong theory. if he wants to believe in that fairy tale, he has every right to do so. >> reporter: they're considered prime billboard space. the atheists say they spent over $20,000 to put up their billboard for a month. 15% of americans claim no