I remember reading a nice SF book about 8-9 years ago but I can't remember its title or the author.
It was similar to The Hitchhiker's Guide to the Galaxy, with a man, possibly a girl too, leaving the Earth after the planet was close to destruction / apocalypse. They travel from planet to planet in search of God or someone able to answer his fundamental questions about life. At one point, the hero drinks a sort of immortality potion that allows him to live for over 1000 years.
He manages to find God's planet in the end, which is a very bureaucratic place, and he asks why are things the way they are, with injustice, evil and so on, and he receives an answer similar to "Why not?"
Does this sound familiar to any of you?
It seems I'm not the only one searching for this book. I remember the humor in the book and the other details mentioned also sound familiar to me. Unfortunately, no answer was found on that site either