The humanist describes their journey from atheism to rationalism and humanism over 50 years. They stopped believing in supernatural powers like God and astrology as a child after beginning to question beliefs. They were inspired by rationalists who conducted programs exposing religious miracles as tricks. The speaker challenges any supposed miracle workers to prove their powers under controlled conditions for a chance to take their wealth, but none have accepted. The key message is to question claims before believing and demand evidence, as there are no genuine supernatural powers.