Come on now. The idea that atheists mass together to create mayhem is imaginary.
Generally, we are just a relatively silent micro-minority; atheists aren't going around saying -- "I'm an atheist, are you?" Even if there was an organized body of like-minded people, I would have no reason to join it. I have no agenda to push.
I don't care if you choose to embrace and celebrate religion. I just don't happen to choose that path.
This country will never be communist because the founding fathers had the incredible foresight to assure that every individual of ANY religious persuasion, including atheist, would have an extraordinary personal stake in maintaining their freedom of religion.