If one looks at comparative mythology, links can be found to trace a number of deitys back to previous religions/mythology.
Example...
Set - Egypt
Herman te Velde dates the demonization of Set to after Egypt's conquest by several foreign nations in the Third Intermediate and Late Periods. Set, who had traditionally been the god of foreigners, thus also became associated with foreign oppressors, including the Assyrian and Persian empires.
It was during the time that
Set was particularly vilified, and his defeat by Horus widely celebrated.
Set's negative aspects were emphasized during this period. Set was the killer of Osiris, having hacked Osiris' body into pieces and dispersed it so that he could not be resurrected.
The Greeks later linked Set with Typhon because both were evil forces, storm deities, and sons of the Earth that attacked the main gods.
https://en.wikipedia.org/wiki/Set_(mythology)
Now lets look at Typhon...
Related concepts and myths
See also: Proto-Indo-European religion#Mythology
Since Herodotus, Typhon has been identified by some scholars with the Egyptian Set.
In the Orphic tradition, Typhon leads the Titans when they attack and kill Dionysus, just as Set is responsible for the murder of Osiris. Furthermore, the slaying of Typhon by Zeus bears similarities to the killing of Vritra by Indra[6] (a deity also associated with lightning and storms), and possibly the two stories are ultimately derived from a common Indo-European source.[citation needed]
Similarities can be found in the battle between Thor and Jormungand from Norse myths, as well as (perhaps) an incident in the Irish Metrical Dindsenchas in which the Dagda fights a giant octopus.[7]
Mythologist Joseph Campbell also makes parallels to the slaying of
Leviathan by
YHWH, about which YHWH boasts to Job.[8]
en.wikipedia.org/wiki/Typhon
lets look at levithian versus YHWH
Christianity
The Leviathan of the Middle Ages was used as an image of Satan, endangering both God's creatures—by attempting to eat them—and God's creation—by threatening it with upheaval in the waters of Chaos.
Leviathan in Satanism
The Church of Satan uses the Hebrew letters at each of the points of the Sigil of Baphomet to represent Leviathan. Starting from the lowest point of the pentagram, and reading counter-clockwise, the word reads "לִוְיָתָן". Translated, this is (LVIThN) Leviathan.
en.wikipedia.org/wiki/Leviathanin South Semitic languages like Arabic. HWY in Arabic is connected with falling or causing to fall, leading to an interpretation of Yahweh as a storm god whose name means "He who causes to fall" (meaning rain, lightning, and his enemies) or "He causes storms". This helps explain Yahweh's attributes as a storm god (he comes to rescue Israel surrounded by darkness and thick clouds, and the earth trembles, the clouds drop water, and the mountains quake at his appearance),
Christianity
Almost all Bibles (KJV, DRC, RSV, ESV, NASB, NIV, NJPS, NRSV, NAB, NABRE, CCD, NEB, REB, NKJV, etc.), substitute the terms "LORD" and "GOD" in small caps wherever the tetragrammaton appears in the Hebrew; exceptions include the Jerusalem Bible and New Jerusalem Bible, and a few uncommon translations such as the Rotherham Emphasized Bible.
The liturgical use of "Yahweh" in vernacular worship was banned by the Vatican in 2008,[50] and the Vatican Congregation for Divine Worship and the Discipline of the Sacraments has
directed that the word "Lord" and its equivalent in other languages be used instead.
en.wikipedia.org/wiki/Yahweh
Yahweh v Leviathan
One of the oldest surviving battles in ancient mythology is the struggle of the Hebrew god Yahweh against the chaos dragon Leviathan. Though somewhat crowded out of the Bible in favor of more boring stories of the Hebrews wandering around the desert, the fish tale can be pieced together through bits found in Isaiah, Job, and Psalms.
The book of Job has the most detailed description of Leviathan
Job 41
His sneezings flash forth light, And his eyes are like the eyelids of the morning. Out of his mouth go burning torches, And sparks of fire leap forth. Out of his nostrils a smoke goeth, As of a boiling pot and burning rushes. His breath kindleth coals, And a flame goeth forth from his mouth.
universalheretic.wordpress.com/2010/01/06/yahweh-v-leviathan/
One more...
we may therefore unhesitatingly affirm that Levi means Serpent.
Mythology speaks of a serpent that devours the sun, of a Storm-Serpent, which
the Sun assails with his rays …
the monotheistic ideas of later times substituted (the sun for) Jahveh [Yahweh] who with his might lashes the sea, and who with his intelligence pierces the monster
-Ignaz Goldzihek, Mythology Among the Hebrews
archive.org/details/mythologyamongth00golduoft
SUN-Day
Really, I thought that would have been obvious to you. I don't know what your problem is novum. 
And then there's games too, there would not be games like Doom without satan being so cool character to have, cheesy catholic devil & hell makes a good background for any kind of 'demonic invasion' story at least.. Although, Dooms imagery is sort of catholic fire and brimstone hell combined with Lovecraftian hell.
