What is the main conflict in Sum: Forty Tales from the Afterlives by David Eagleman?

"Sum," is a collection of stories about the afterlife and the possibilities are endless. The author, David Eagleman, uses the far reaches of his imagination to create forty unique takes on afterlife. Death and what follows is, to many, a mysterious subject and the author capitalizes on that mystique. Eagleman presents his many scenarios of what might be or what could be in the afterlife. The author takes the image of the creator to the extremes. In one narrative, "The Microbe," he describes god as the size of a microbe, so small that he does not know that we exist. In another tale, the reader is told that god is a Giantess who is so large that it is virtually impossible to communicate with her. She does not know we are there!