Any study which, based upon statistics reporting the percentage of atheists among scientists, concludes that atheism and intelligence are related simply draws an invalid conclusion IMHO. The reason is simple: science is a discipline which seeks to explain the physical world. Why would we expect that those who’s intelligence is directed toward such a discipline would be inclined to embrace the spiritual? I certainly wouldnt.
In the same way, the speculation about “higher education leading to atheism” fails to recognize something that statistics fail to grasp: certain forms of education represent nothing more than a financial investment in one’s future. If someone, motivated by the prospect of higher income, pursues higher education why would we be surprised to find that they are, like the scientific group, more material? I certainly wouldnt.
The bottom line is that the entire combined intellect of all higher education and scientific information has failed to definitively demonstrate the validity of atheism. It has failed to explain how our universe came to be, how humanity has become what it is, why humanity is what it is within the context of the theory of evolution, and why there is a longing within each human being - throughout all ages and cultures - that seeks to explain those basic, inherent and exclusively human issues: Who am I, What am I, Why am I, What does the future hold for me?