“Earthquake” and “mountains and islands out of their places” in that PARTICULAR passage are largely symbolic. It’s the same as “faith can move the mountains”. That mountains usually refer to earthly civil power, either political, economical or institutional, the same kind of languages can be found in the OT prophecies.
How do you get "largely symbolic"? The 2 passages are describing virtually the same thing.
Besides, that was the beginning of the end, afterwards there are five months of trumpet judgement, and at that points all God’s people are in heaven.[/QUOTE]
Only if one believes that there will be a resurrection before the Tribulation and Jesus takes all the resurrected believers to heaven. But there are no verses that say or even suggest such a trip to heaven. So no, not "all believers" will be in heaven. The single resurrection of the saved will occur "when He comes" (1 Cor 15:23) and the verse says it will be "those who belong to Him", which means ALL believers.
If that were the end, then how do you explain the next seal as the prelude to the 7 trumpets?
Actually, I don't explain any of the 3 sets of judgments. Certainly there are parallels between the sets, but I (and a whole lot of scholars) aren't sure whether John wrote sequentially or that they all occur together, or overlap. For me, it doesn't matter. Those who live in the Tribulation will see what occurs and in what order. It's not for me to figure it out. It will all come out when it unfolds.
My interest is in the overall over of things, and the Bible is clear: the "Restrainer" is removed first. 2 Thess 2. Since this cannot be the Holy Spirit, it refers to the nation that is the "moral policeman" of the world, keeping evil somewhat at bay. I believe this has already been fulfilled as the USA, which has been this restrainer, no longer is. The "removal" can be argued as either at the election in 2020, or when the new administration actually took over.
Looking at the "4 horsemen of the Apocalypse" in Rev 6, it can easily be argued that at least 3 of them have already been released on the world.
Then, the whole of the Tribulation will unfold. Then, Jesus Christ will return as King of kings at the Second Advent with the whole host of heaven, which is all the dead saints. They will meet all the living saints in the air, everyone will receive a glorified resurrection body, and Jesus will personally end the battle of Armageddon, and set up His Millennial Kingdom. Satan (and all his angels) will be locked up for 1,000 years, to be released near the end to deceive the world once again and attack Jerusalem, where King Jesus is reigning.
Every unbeliever will be killed at that battle of Gog and Magog, only to be physically resurrected to appear at the GWT judgment, and then be cast into the lake of fire, where there physical bodies will die once more. Hence, the LoF is also called the "second death" several times in Revelation.
And then the eternal state begins at Rev 21.
That's my story, and I'm sticking with it. Because Scripture backs it up.