The caricature of gnu atheism has it as obsessed with wiping out every vestige of religious belief. A more accurate view of what many atheists want is just to eradicate the meme-pair that demands conversion of the world to the religion that it infects and condemns those that don't convert to hell. Though the pair may infect other religions, fundamentalist Christianity and fundamentalist Islam seem to be the major hosts right now. Those 2 groups thus face off, each with the idea of eradicating the other. If they just did that and left the rest of us in peace, it might not be so bad, but since they might just take the whole planet with them (keep in mind that, depending on which party is in power, fundamentalist Christians either control the US government or at least influence it strongly), we all have an interest in getting rid of the meme-pair.
That is why I am much more interested in working with theists who don't condemn or try to convert good people who don't share their beliefs than I am in increasing the number of atheists. We all have a common cause of reducing the influence of the idea of conversion by the sword.