Those who denigrate religion and all who are inspired by it while pretentiously insulate themselves from criticism with the childish mantra that atheism is no more than the absence of belief know nothing about history and even less about anthropology.
Most atheists don't denigrate religion, they criticize it. But certain religious people don't react well to the criticism of their own religion, because they feel that criticism is directed to them. I can assure you it is not.
I will try to give you an example. The atheist billboard that was erected in a couple of places in America had a quote from the bible: "Slaves, obey your masters" Colossians 3:22 - that is not taken out of context. If I actually believed that the Bible is inspired by god - I would have rejoiced. But christians got extremely mad, and even destroyed some of these billboards.
Any theist can quote from "God is not great" by Cristopher Hitchens or "The god delusion" by R. Dawkins, or even "Dune" by Frank Herbert, and all the other books I enjoy (not out of context of course) and I will not be mad.
And by the way - you confuse atheism (lack of belief in a deity) with hate for religion. They are not equivalent, and not even remotely similar.
Hate for religion is not all the time rational. It can be taken to the extreme, but it is caused most of the time by past experience with religion, and the people or actions who represent it - not by their lack of belief in a god.
And this hate for religion taken to the extreme is one of the underlying causes of atrocities caused by atheists against religion. Also, I would argue that it is similar (to a certain extent) to the hate one religious group has for another (just trying to make the point that it's not something only atheists have).
Cheers
PS: I actually did my best to not be offensive. If I failed - I do not apologize, because I don't require your permission to express my thoughts.