There is no "atheist movement"
Like the fucking tin says, an atheist just thinks there are no gods; that's hardly a foundation for a single-minded society of intellectual individuals. It's too damn bad you seem to think everything under the Sun is permissible lest one be branded stupid, but that's your right, for now. Others have seen the harm religion can do, and recognized it as the greatest obstacle before a better mankind.
And like one of the books says in the introduction (I think it's Dawkins but I'm not sure), the arguments presented are for the arm-chair faithfuls, the Homer Simpsons of the world. Ned Flanders is already gone, he is a foregone conclusion insofar as the discussion is concerned. He is "the enemy" in the sense that his very psyche is so intertwined with his faith in sky pixies that it would literally take years of reprogramming and therapy to make him a whole human being without the faith. No one wants to do that. People like that are failures; it's sad, but many facts are. They are "the enemy" because they perpetuate the bile that is religion, they promote it as the singular source of goodness and morality when it is anything but, and they want to indoctrinate small children with their absolute bullshit. So these children, too, would require years of reprogramming and therapy to get over the complexes believing in a sky pixie seems to create in those who're not utter nincompooops.
The point with the Munich comparison isn't that all religionists are mass murderers, olol,
, or what have you; Chamberlain has been lambasted for decades for his seeming willingness to avoid war
at all costs, even against an enemy that only later turned out to be pretty bad. Similarly, being courteous and never daring to upset the Ned Flanderses of the world just helps perpetuate and maintain that ugly cycle of utter devastation and suffering that is religion and faith. It is not a descent from some intellectual or moral high-ground to realize that yes, some people are fundamentally against everything good and beautiful in this world, and something ought be done against them.