Its all very well for people to dream about eradicating religion, but what good would it do? It is in man's nature to be tribal, belligerent, distrustful and aggressive. If you eliminate religion as a cause for people, you will find it rapidly replaced by politics or racism as the cause for war and violence. How many massacres, wars, genocides and the rest have overtly political causes when compared to religious causes? Things like the collapse of Yugoslavia may be dressed up as having a religious element, but the massacres would have happened without any religious divide to name but one.
Was the holocaust religious or was it political? Was the Kurdish massacre by the Turks religious or political? Rwanda? Would the disaffected youth of the West be just as pee-ed of with life if Islam wasn't there? I would say almost certainly. It may be harder to convert them to violence for political aims, but not impossible.
Religion is a convenient whipping boy for unrest and violence, and perhaps a convincing rallying point for all the mal-contents and others, but it isn't the cause.
Destroy religion and bugger all will change.