My personal opinion is that everything in the bible is a paradox: paradoxically real and figurative. It sort of alludes to the son of man/Son of God human/spirit paradox we exist in. (The only one who was united as a perfect Son of man/God is Christ.)
With that said, I think all the trumps, vials and seals are literal. In Hebrew history, a seal was a written issue of something to come - a war, help, resources, calamity, etc. It is the messenger's job to deliver the seal
without the seal broken.
The first four seals are the first four horsemen, which in my opinion are literal (conquerer, war monger, pestilence/famine, mass death.) It is not hard to see that these four things have either
chronically occurred over two thousand years (with imperialism, Jesuit evangelicalism, inquisitions, torture, world wars since the 600s, etc,) or they will
acutely occur in the future.
The fifth seal is what points us in a better time frame, as those in Heaven ask God how long will it be till He avenges them. God tells them that it will occur in a little season, when believers/saints are killed according to what should be fulfilled (Daniel 11:33-35.) This seal isn't a consequence of the other four, it is an informative seal giving us the time period and events showing the end.
The sixth seal, trump and vial are tied with each other (666,) and are characteristics of THE antichrist, and his advent. Similarly, the seventh seal, trump and vial (777) are characteristics of THE CHRIST'S, and His advent. Sixth seal is darkness, earthquakes, and
the moon becoming red as blood.
The seventh seal is the end/information is given to the reader.
The trumps, in history, announced someone/something's arrival. The trumps, we see, are calamity.
The first is
fire mingled with blood
The second is
a great mountain burning cast into the sea.
The third trump is
a star called Wormwood that comes upon the earth, killing a third of things.
The fourth trump is s third part of the moon, sun and stars were darkened.
The fifth trump is when a
star/Angel Abaddon (Abaddon = The Destroyer) with the authority to open the bottomless pit falls unto earth.
The sixth trump is when the 200,000,000+
creatures are revealed by the bounded angels of the Euphrates (this reminds me of angelic creatures dropping onto world to torture men and terrorize women
before Antichrist makes his heroic entrance, similar to the angels that fell in Genesis.)
Seventh trump - end/information given.
The Vials are bowls of judgment poured upon a rebelious people. In order for bowls of wrath of God to be poured out, Abaddon/The Beast/Antichrist/Satan-As-Man will need to be established on earth, and polluting it (this saturation of pollution will eventually lead to the abomination that causes desolation.) These vials are for the people that accept the Mark of the Beast: God isn't angry at His saints, the same way He wasn't angry at them during Exodus.
Bowl 1: Noisome and grievous sores befall those who
have received the mark of the beast.
Bowl 2: Sea becomes blood; massive marine life die-off
Bowl 3: Rivers and fountains become blood
Bowl 4: "Power was given to scorch men with fire;" a super-solar x-flare, weakening magnetic field strength, ionizing radiation etc.
Bowl 5: This vial is poured onto the
seat of the Beast. His kingdom becomes full of darkness, and the people gnash at their teeth
Bowl 6: Euphrates dried up to prepare a way for war
Bowl 7: It is finished. (Christ's Advent)
These bowls, trumps and seals seem VERY literal to me. Moreover, there are universal structures that fit the cosmic signs of the trumps, vials and seals (as well as terrestrial structures.) Specifically, the trumps sound exactly like what would happen if the earth is being affected by a very large gravitational and electromagnetic body.
Comet Elenin: Preview of a Coming Attraction - NASA Jet Propulsion Laboratory
Wormwood (star) - Wikipedia, the free encyclopedia
Nemesis, Proposed Companion Star to the Sun and Mass Extinctions on Earth
Of course, these pose "no threat" to us...