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In page William Irwin Thompson:

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Thompson sees the Stone Age religion expressed in the Venus figurines, Lascaux cave paintings, Çatal Hüyük, and other artifacts to be an early form of shamanism. He believes that as humanity spread across the globe and was divided into separate cultures, this universal shamanistic Mother Goddess religion became the various esoteric traditions and religions of the world. Using this model, he analyzed Egyptian mythology, Sumerian hymns, the Epic of Gilgamesh, the cult of Quetzalcoatl, and many other stories, myths, and traditions. Thompson often refers to Kriya yoga and Yoga Nidra throughout these analyses, and this seems to be the spiritual tradition with which he is most comfortable.