Are they just anti-christian? It seems to me that a significant proportion of atheists (speaking only from personal experience rather than having a statistical source) commonly rail against Christianity in general, and against the perceived hypocrisy/ perceived lack of questioning of Christians in particular whilst ignoring dozens of other faiths and beliefs. Yes there may be the odd foray into Islam or Judaism but it seems pretty much every other religion/faith/belief gets off unscathed?

Is this simply because of familiarity with Christianity in the West? Or have the (some would say) un-christian actions and("you are going to hell because you don't believe what I do") stance of much of the organised church and its ministers etc. over the years, brought an anti-christian sentiment to the fore, and almost by default produced "atheists" who in reality have a larger percentage of anti-christian/anti-abrahamic about them rather than purely atheist philosophy/belief?