This is similar to Short story about an atheist dying, being resurrected by God in heaven to perform a mission I remember a story about a man named Walter Jehovah who discovers that Bishop Berkely was correct and he can erase anything from the universe by "disbelieving" in it. He eventually "disbelieves in everything", including his body, and is confronted by God. He realizes that God set this up in order to commit suicide. He then disbelieves in God who disappears. He then tries to disbelieve in himself and fails. He wants to commit suicide, and finally thinks of a way: "Let there be Light".
What is the title and who is the author?
I forgot the name of the philosophical idea too.