As I see it from my source of information, Enki and Enlil were 2 real beings. Both were reptilians aliens and were rivals.
ENKI = EA-SU, EN.KI, Lucifer, EA, Poseidon, Ptah, Samael, Osiris (who was killed by Seth) reincarnated into Horus who was the second Marduk.
Enlil = Satan, Yahweh, Zeus, Seth and was the first Marduk.
*Marduk is a title (administrator or ruler), not a name.