The ancient 'deities' are demons which scripture tells us would either be bound and held over for judgment, (through open violations of divine Law), or would avoid this by joining their existing systems together into one worldwide system called the 'mystery lawlessness,' (2 Thessalonians 2:7), after a grand scale betrayal of the Church, in emulation of the personal betrayal of Christ by Judas Iscariot.
Christ called Judas 'huios apoleia' meaning, 'son of destruction,' (John 17:12), the same phrase used to describe the grand scale version known as the 'antichrist' movement, (2 Thessalonians 2:3, 'huios apoleia'), and the same word translated 'Apollyon' that is used to describe the 'angel' given the 'key' to open the Biblical abyss, (Revelation 9).
We know the 'son of destruction' better as 'atheistic science,' the demented version of the 'science' born inside of the original Christian 'university' system. This bizarre movement betrayed the Christian system, (2 Thessalonians 2:3-4), then went on to trap themselves inside of an inescapable arms race, presided over World Wars and brought about the modern and expanded version of the Biblical 'abomination of desolation' more widely known as 'nuclear ordinance.'
The 'abyss,' (also known in scripture as 'outer darkness'), is the location which modern people know as 'space' and the 'smokey vapor' released during the process of opening it to travel, (the 'key'), which scripture symbolically describes as releasing horrible plagues upon the whole world, is the cancer-causing pollution from the 'mega-industries' required by the arms race and the 'key' necessary to open up space.
If you look carefully enough, especially at the exact 'price of Progress' required by modern atheistic science, you will find the same type of bloodletting and sacrifices historically required by each of the 'ancient' gods and their established religions, only this blood and expense is being obscured inside of a system that claims superiority over all gods and objects of worship, (denying them all), just as scripture predicts they would, (2 Thessalonians 2:4).
A 'demon' is similar to 'bad computing software,' only it is fully alive, sentient, highly intelligent and already integrated into nature. 'Angels' are likewise, only they are like 'good' programs seeking to keep 'crashes' from occurring and to establish the inevitable 'kingdom' social patterns being commanded by Christ. They are GOD's pre-existing original version, which mankind is instinctively but poorly emulating with its 'artificial intelligence' pursuits. This will become obvious at some point, since these realities cannot remain hidden behind 'spin' forever.