In the beginning there was nothing (Nun). A mound of earth rose from Nun and upon it Atum created himself. He spat Shu (air) and Tefnut (moisture) from his mouth. Atum’s two offspring became separated from him and lost in the dark nothingness, so Atum sent his “Eye” to look for them (a precursor to the “Eye of Ra”, an epithet given to many deities at different times). When they were found, he named Shu as “life” and Tefnut as “order” and entwined them together.
Atum became tired and wanted a place to rest, so he kissed his daugther Tefnut, and created the first mound (Iunu) to rise from the waters of Nun. Shu and Tefnut gave birth to the earth (Geb) and the sky (Nut) who in turn give birth to Osiris, Isis, Set, Nephthys and Horus the elder. In later versions of the myth, Atum produces Shu and Tefnut by masturbation and splits up Geb and Nut because he is jealous of their constant copulation. However, his creative nature has two sides. In the Book of the Dead, Atum tells Osiris that he will eventually destroy the world, submerging everything back into the primal waters (Nun), which were all that existed at the beginning of time. In this nonexistence, Atum and Osiris will survive in the form of serpents. –Atum, Gods of Ancient Egypt
There are a lot of parallels formed between the characters David and Weyland with Atum. David at the end of Alien: Covenant regurgitates two Facehuggers from his mouth, his children, just like Atum gave birth to his children.
In the prologue, it is a close up of David’s eye, and he is sent into the cosmos to find out the origin of mankind, just like Atum sent his eye out to find his children because after they were born he lost them in the dark.
The Prometheus crew find the Engineer pyramid on LV 223, which represents the first mound he created.
The black ooze they find could also be compared to the primal waters of Nun from which the Earth was created.
The end of the world which Atum speaks of to Osiris could be seen in the destruction of the Engineers as well since the only things to survive were the Xenomorphs/Serpents.