Brian is inviting us to face "reality" that makes us feel secure and at peace with existence in which mortality is the reality. The problem is that Homo sapiens' brain evolved in Savana Africa to survive the elements. And to survive the reality of mortality (the element) is to believe in superstitions and nonexistent gods. No wonder a huge majority of the members of the species of Homo sapiens believes in gods.  Do you believe in god/s?