There seems to be some interest in my Helium article on the causes of atheism. The link to this article is here.
Note: this article is not speaking in reference to individual reasons to align with atheism, but with great brevity addresses the cultural and historical context of atheism and new atheism. This is by no means a comprehensive article.
I chose to address it in the historical movement context rather than citing various reasons individual people are atheists for those answers are diverse and I would do them an injustice to lump them into a handful of reasons.
Just the same, all feedback is appreciated.