The folks of Sodom and Gomorrah experienced "God's wrath" and yet Lot and family experienced it while on earth. The folks of Noah's day experienced "God's wrath" and yet Noah and family felt the vibrations of God's wrath first hand. Both faithful groups were spared any harm (save Lot's wife) but they were first hand witnesses to the wrath of God. Matthew says that the tribulation to come will be like it was in the time of Noah:
Matthew 24:37, "But as the days of Noe were, so shall also the coming of the Son of man be."
Christ shall return and bring His wrath with Him.
Matthew 13:38-43, "38 The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one;
39 The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels.
40 As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world.
41 The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity;
42 And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.
43 Then shall the righteous shine forth as the sun in the kingdom of their Father. Who hath ears to hear, let him hear."
Where are the "righteous" during this time of tribulation? Right in the same "field" as "the tares." Who are removed from the world at this time? The tares are plucked up while the wheat remain.
In a pre-tribulation rapture, what would a timeline look like?
Present Age / Rapture / Tribulation / Millenial Age
Where do you place certain events like this one (Revelation 20:3)?
Revelation 20:3 And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season.
Where do you put the loosening of Satan? Revelation 20:3 says it is after 1,000 years. I would place it at the end of the millennial reign of Christ while others would put it during the tribulation because maybe they are a-millennialists (no millennium).
So when would the righteous be separated from the wicked? At the end of the tribulation or at the end of the millennium? That effects your timeline for a pre-tribulation rapture timeline. You can have any timeline you want for your beliefs but according to a pre-tribulation rapture timeline, you have to be able to place these events to answer your question.
During the tribulation, there are going to be babies born. Do you separate the righteous from the wicked then or do you wait until the end?