Why do Atheist only attack Christians?

ok So they call themselves Atheist, and Atheism is the disbelief in anything divine or spiritual, so this would mean they don't just disbelieve the existence of God, but they shouldn't belief in an God or Goddess or high power or metaphysical force, and with that said their are over 2000 registered, and officially recognized religions around the world, and thousands more unregistered or unknown. and Atheist ***** about Christianity like its a plague. but, the other existing religions pretty much go un scathed. and granted Christianity isn't the greatest religion, it has its fault and darkside that any other religion pretty much has. so why so much hate on one religion, in almost the same fashion that Nazi's hate Jews? i mean i pretty much stand on the sideline of the whole religion vs nonreligion thing. and as i see it theres fundamentalist, and fanaticalness, and radicalist on each side. So, why so much hate? why can't you just tolerate each other like you should, cause people have different beliefs, and hate just leads to persecution which occurs, and oppression, and in extreme cases genocide. but, if your gonna be "atheist" why focus on one religion instead of hating them all equally? i mean atleast be through and consistent in your hate. and no im not promoting hate or violence im just saying.