A common argument in Western Society is that biological evolution disproves the Judeo-Christian god because it dismisses the literal Biblical creation story as myth. However, I think that this is only a superficial argument that does not address the root of how God is "killed" for many.
I think the death of "God" comes when one reconsiders the way one understands with the world on a psychological level, thereby creating new symbols for the affiliation one has with the world. For instance, the conflict between the Day and Night is not a literal "conflict", but rather a personification of our own conflicted psyche; and similarly, the conflict between God and Satan is a personification of our own psychological war between good and evil.
Our psychological conflicts are just platforms for denotations, and those denotations are subject to our individual experiences. Quite often those experiences are influenced by cultural strains who foster the veneration of specific symbols; and culture clash occurs when one culture's symbol opposes another. On a microscopic level, this even happens between individuals. For instance, an Atheist may clash with a Theist, but they only clash because they fail to recognize that they are venerating different symbols by the same fundamental subconscious motivations.
So, for all intents and purposes, the subconscious "God" never dies, nor do we kill it. We just resurrect it by our own avatars so that it may be used to communicate with others.