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2-5 Sumer An early account of 'creation', which taps on this topic, comes from Sumer which is older than 4000 years - in a translation of tablet 1.1.2, a narrative of 'creation' and the role of the Gods Enki and Ninmaḫ.
Six differences were mentioned some of which were ‘non-binary’.
 [Reference for the translation of tablet 1.1.2, below]* Old Egypt In Old Egypt (OE), King Hatshepsut, for instance, has been known for displaying a ‘non-binary’ gender identity. This also included other Kings and Queens from OE - which includes: Tiye, Akhenaten, Nefertiti and Tawosret. 
 This also includes the Goddess Mut who is known as a 'hermaphrodite', and is depicted in one reference with an 'erection' in an image - "the Book of the Dead" in 
Ch. 164 [cited in P.173 (Diamond 2020)]. 
 References & Supplementary Data 
Diamond, K. A. (2020). Hatshepsut: Transcending Gender in Ancient Egypt. Gender & History, 32(1).
 *https://etcsl.orinst.ox.ac.uk/section1/tr112.htm