This is an older article from Wired, but I think it makes the point well enough for me.
People in general do these things with ideas and when they get into large groups.
Some particularly vocal "new" atheists have suggested some fairly draconian measures of their own for dealing with the "problem" of others
not believing the world is exactly as they see it. (Not to say *all* atheists or agnostics feel this way...and certainly not saying that this point makes all atheistic commentary invalid as a result.)
I'm not a Mormon or a Muslim, but I think that both groups have their good points. Religious tolerance (and tolerance of non-religious worldviews) seem more productive than a rigid adherence to either religion or non-religion.
As for deaths for "heresy" and Christianity, I think this is pushing it a little. Yes, Christians have been wrong in the past and probably will be wrong in the future. But, do you honestly think people weren't hacking other people up and/or burning them before Christianity came along?
The problems of *all* religions and other worldviews that collect "followers" lie with the
people in them. This is true for atheism and for theism alike (noting here that those are not the only flavors of worldview on the market).
To call the realm of religion "imaginary" is a bit unfair. It is myth and allegory and an attempt to tap into the larger themes and the intangible. I don't support or condone jihads or crusades, but dying for certain principles and beliefs (i.e. sacrificing individual needs for the greater good, and things along that line) are worthy of praise. Writing it all off as a con is disingenuous.