So Egyptian cosmology is very interesting. Though the religion is polytheistic, it also carried monotheistic tendencies. The idea of one becoming many through masturbation (Atum), Words (Ptah), Cosmic Egg (Thoth or Ogdoad) is present in the existing cosmogony myths +
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So in a way, it was monotheistic, and wasn't. We see a similar concept in gnostic Christianity and Hinduism