This book is the compilation of the two parts of the "Inside a Non-Believer's Mind" series. In the first part, the author explains why he became a freethinker, and atheist, despite having a strong religious upbringing. He also explains the concept of atheism, and why he believes that our differences only reflect our humanity - that we all come from different parts of the world, different backgrounds, and have different belief systems. He only hopes that we can recognize that we are more alike than we are different. In the second, part, he argues that the concept of God is poorly explored by believers, and greatly explored by non-believers, when in reality should be the opposite. As religious people grow up in religious environments, at some point God becomes just a word without a definition, and people lose perspective of what they really mean when they say: I do believe in God. The author also defends the concept of morality on the absence of religion, which is of paramount importance for those who wonder about good and evil in a humanist, science-driven society. His only true objective is to promote reason and tolerance, and both believers and non-believers alike will find his work enticing, and thought-provoking.