I'm not going to call my brothers and sisters "demonic" for believing a lie. But the doctrine is definitely not inspired by God.
Pretrib was *never* taught in all the history of the Church until John Darby came along in the 1800s, reinventing modern Premillennialism. To be truthful, I do believe Premillennialism is correct. I just don't believe Pretrib should ever have been coupled together with Premillennialism.
Although Darby initiated a Protestant version of Prophetic Futurism, Catholic Francisco Ribera had centuries earlier promoted Prophetic Futurism, as well. Ribera had, as his motive, a desire to separate Catholics from the Protestant charge that the Catholic Church was the Antichrist. If Antichrist is a future prophecy, then the Catholics could not, at that time, be the Antichrist.
By contrast, Darby apparently sought to separate out an elite Church from all organized Christianity, including from the Catholic Church. Only a super-spiritual Church would be qualified to escape the coming horrors of a future Tribulation, in which Antichrist kills Christians, and the world suffers consequent punishments from God. The elite Church is thought to be immune from this time, just as in the Early Church Christian Jews were given to escape the 70 AD punishment of Israel by the Romans.
In reality, the book of Revelation does not depict the time of Antichrist's Reign as a time of punishment for the world. Though some suffering always takes place in this world, particularly among the wicked, final punishment is largely reserved for the time of Christ's Return. So there is no thought, biblically, for an escape, by the Church, from the time of Antichrist's Reign. On the contrary, the Church is depicted as faithful and honorable during this time, for holding fast to the faith, even under persecution. This also is how the Early Church viewed persecution, as an honorable thing honored by Jesus.
Surely we should look at it the same way, instead of seeing all Christian suffering as a shameful thing. It will not be honorable to run away from testifying under difficult circumstances. Actually, every day this is how we testify to the truth, by abhorring the ways of the world and trying to live a righteous life. We do not run away from testifying to the truth so as to help people escape from their sins. Rather, we endure some abuse in order to get the message of deliverance from sin across. It is worth it to bring glory to Christ, who also suffered from sinful men.