In the beginning there was only dark, swirling chaos.
Atum rose out of these waters. He created himself using his force and sheer force of his will.
He created a hill, so he had somewhere to stand.
Atum was neither male nor female and he was lonely so he created a son and daughter. They both finish separating the chaos, but they didn't separate all the chaos and Atum son got lost in the dark waters of Nu.
Atum was worried and sent his all-seeing eye out to find his son and when his all-seeing eye came back and Atum saw his son he started crying with joy because his son was safe.
Atum's tears created the first men of Egypt. These men had the responsibility of keeping Egypt separated from chaos and they worshipped all the Gods of Egypt.