Book acquired: Shada (Doctor Who: The Lost Adventure by Douglas Adams), by Gareth Roberts.

It starts this way:

At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways — with relief or with despair. Only Skagra responded to it by thinking, Wait a second. That means there's a situation vacant.

I had this revelation at the age of four. I was sitting in church, humming. I definitely felt relief, mostly because this meant it was merely parental authority compelling me to attend mass on a weekly basis, not anything higher. This was something I could work with.