A fair criticism in its own right. However, using the failings of a case study to argue against a certain philosphy or world view is an argumentative fallacy.
Just as using the failings of certain instances of atheistic, scientism based world view as an argument against the validity of atheism would be a fallacy. Take for example Stalin, Mao, Joseph Mengele...Eugenics, Social Darwinism, etc.
I assure you that if the discussion devolves into a "your side is worse than my side" contest I win handily. I would much prefer to have a more productive argument.
I would accept your examples better, if I didn't know better than to assign the acts of Mao or Stalin as being enacted upon in the name of atheism, any moreso than the acts were perpetrated on the basis or doctrines of 'maledom' or being over 4 feet tall, or having dark hair or on the principles of physics.
And can creationism be called a mere case study? It is the dominant view and belief of the majority of the religious people in the world(Christians + Muslims) and the dominant view of the majority of the religious people in the most powerful and influential, not just politically, economically, culturally, or militarily, but scientifically, country in the history of the world.
I don't think it's a case study, but more of an ignorantly accepted mainstream view that is dominant and continues to be perpetuated among the two largest cults on earth....the death cult of christianity and the submission cult of islam.
Not sure if you were trying to tie Eugenics to Nazism either, but regardless, Eugenics is a complex subject, and not something easily thrown pejoratively at the feet of atheism, if in fact that's what you were attempting to do.
Any time you want to play side versus side though, i'd be happy to oblige. You can argue all the examples of atrocities in the name of Atheism, and I'll do so in kind for all the atrocities in the name of all religion. That's an easy war to wage, should you decide to.