 Many Egyptologists and <unk> have suggested theories about how the gods developed in these early times . <unk> <unk> , for instance , thought the Egyptians first revered primitive <unk> , then deities in animal form , and finally deities in human form , whereas Henri Frankfort argued that the gods must have been envisioned in human form from the beginning . Some of these theories are now regarded as too simplistic , and more current ones , such as Siegfried <unk> ' hypothesis that deities emerged as humans began to distinguish themselves from and <unk> their environment , are difficult to prove . 
