INTRODUCTION Catholic Church is one of the oldest and most powerful institution. How did idea of Americanism enter into its American stream 200 years back, and what was its impact? What exactly was the idea? Through the blog involving book review on the subject, we attempt to answer these questions. As in any study-group, we can summarize the blog, outline it, or do in depth study of some or all parts of blog.  Complete blog can be viewed here - http://reasonversusmysticism.blogsp