Chapter one, "A deeply religious non-believer", seeks to clarify the difference between what Dawkins terms "Einsteinian religion" and "supernatural religion". He notes that the former includes quasi-mystical and pantheistic references to God in the work of physicists like Albert Einstein and Stephen Hawking, and describes such pantheism as "sexed up atheism". Dawkins instead takes issue with the theism present in religions like Christianity, Islam, and Hinduism. The proposed existence of this interventionist God, which Dawkins calls the "God Hypothesis", becomes an important theme in the book. He maintains that the existence or non-existence of God is a scientific fact about the universe, which is discoverable in principle if not in practice.