"We Think. Do You?"
WeThinkAtheist.com (Based on the people in the billboard/ad)
iThinkAtheist.com (This based on the person in the billboard/ad)
(I am going to expand on this *With graphics/mock up* so please feel free to put your 2 cents)
(BTW I am going to start donating money to the billboard/ads cause in the up coming months)