It sounds crazy at first. Why, no atheist would want to be ruled by a basically fascistic worldview, where all people are deemed to be evil at their core, and the ending of the human race is seen as the greatest event to ever happen.
I don't like religion, either.
I am a market anarchist. Why, then, would I care which class kidnaps, steals from, and kills its citizens, with no recourse?
The State : It claims to have given us rights which are natural states to begin with. It deems murder to be lawful/moral when it sees fit. It is a monopoly, and we have no choice in the matter.
The Church: It claims God gives us rules which don't exist naturally. It deems murder to be moral when God sees fit. It is NOT a monopoly, and we have every choice whether to follow it, unless it becomes the state.
The wall of separation is guarded fiercely by those who love the law, the constitution, and America. I see none of these as legitimate, so it is not my place to guard this. Those who fight for the wall see the chance of the Church becoming the state as a frightening thing: think of the way it will intrude on us and our private lives! Unfortunately, wall builders, these horrors are already true. We have no choice but to live in a world where our reality is re-defined, and our lives, our values, and our virtues are ruled by fear, violence, and guns. No words on a piece of parchment paper, no matter how distinguished its writer, can keep that out of our homes.