Christians look for Antichrist because Paul said that must happen before Christ can come back for his Church--2 Thes 2.1-3. We are also exhorted by Jesus to keep watch out for false Christs and false Prophets, who claim that somehow their peculiar form of Christianity is bringing in the Kingdom immediately.
Pretribs themselves teach that Christ can come "at any moment." This is the kind of Kingdom hysteria that Jesus and Paul ruled out. The Kingdom comes only when the Father determines such. Until such time our job is to remain active Christians in the spiritual Kingdom of God.
The "Great Tribulation" is actually defined by Jesus in Luke 21 as the punishment of the Jewish People in the present age. I don't need to quote it for you. I quote it all the time, and it is simply ignored by most. They don't want to believe what Jesus explicitly said.
No matter, Jesus said that this punishment began to come upon the Jews after they rejected their Messiah. It was to come upon them in Jesus' own generation, which is what happened in 70 AD, when Jerusalem was overcome by the Romans. Jesus warned that the Jewish religious system would be trashed, and the temple demolished. All this literally happened in 70 AD.
Jesus said certain birth pains would happen as signs that this was about to take place, evidence that the Romans were about to become militarily aggressive, and eventually bring God's punishment down upon the ungodly, wicked Jews. This indeed happened in 70 AD, even though Futurists want everything in Bible Prophecy to be about the future. They want the "Abomination of Desolation" to be about the Antichrist, when it was really about the Roman destruction of the temple in 70 AD! The Church Fathers believed this, and Dan 9 explicitly says it--even the general time when it would happen, after the Messiah is "cut off."
And so, Jewish believers were warned by Jesus that they would have to go through this time of Divine Wrath against the Jewish People generally, even though believers were not the object of this wrath. They had to experience the same fate that the Jewish People had to experience, so that believers would be witnesses to how the Jews *should be.*
Jewish Christians experienced the loss of their nation, and the loss of financial security associated with their fields and animals. They went through this period of wrath, but it was *not* God's wrath against them.
This story is given in the Bible also for other nations who would go through the same experience as the Jews. There have now been Christian nations throughout the world, now in the stages of their own apostasy. And Christians have to be forewarned that they will go through troubles in their own countries, as God begins to bring judgment upon their false religion and wickedness.
In my country, the US, we are experiencing all kinds of judgments, from wild fires in the West to hurricanes in the East. We are all going through the plagues of AIDS and the Coronavirus--all 4 stages to date! This isn't being directed against Christians, but it is *not* God's will to deliver us out of this tribulation, since we are called to be witnesses in this fallen world, to hopefully save some, and to properly judge and see the rest removed.
Your arguments, therefore, miss the mark with me. Sorry.