This is the heart of "Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch". This book is apocalyptically amusing. Not AMUSING, but amusing as I felt a small lack of quick pace and worse villains. 
 The balance between sanity and insanity is perfect. I just kept thinking about what it means to be human, what are the pros and cons, is it worth it (Yep, if there even were a possibility to change it and be not a human :D, but the fact that this book can inspire such thoughts in me somehow made me respect the authors more). 
 The main characters, Yin and Yang, make sinuous, crazy and interesting life story in their own endearing ways. Not being human, they look at the world and humans with a kind of affection. 
 The authors created an entertaining, attractive pseudo-Biblical story with likable characters. I was really concerned for the characters, the fate of the world, and at the same time I was giggling from the absurdities in the story. 
 "Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch" is definitely about faith, superstitions, unawareness, free will and humanity, with its ups and downs. It's about Ye Olde Goode an' Badde, the weird and mad things, the world can offer us. 
 Let's play life then ;)