What is the main conflict in Survivor by Chuck Palahniuk?

Survivor is the story of Tender Branson, who becomes the last surviving member of what the media calls the Creedish Death Cult. The novel begins with Tender on a plane as he records his life story into the flight recorder of Flight 2039. The entire book is structured like a countdown - the chapters are in descending order and so are the page numbers. Tender is on a race against the clock to tell the reader his story.