If you are a Premillennialist (whether Dispensationalist or not), there are several things you must necessarily believe:
*You must necessarily believe that physical death will continue to exist beyond the time of Christ’s second coming.
*You must necessarily believe that the natural creation will continue, beyond the time of Christ’s second coming, to be subjected to the curse imposed by the fall of man.
*You must necessarily believe that the New Heavens and New Earth will not be introduced until a literal 1,000 years subsequent to the return of Christ.
*You must necessarily believe that unbelieving men and women will still have the opportunity to come to saving faith in Christ for at least 1,000 years subsequent to his return.
*You must necessarily believe that unbelievers will not be finally resurrected until at least 1,000 years subsequent to the return of Christ.
*You must necessarily believe that unbelievers will not be finally judged and cast into eternal punishment until at least 1,000 years subsequent to the return of Christ.
Amillennialists don’t see these beliefs being taught in Scripture.
Dispensationalism is a Christian theology holding that time is divided into distinct paradigms according to which God engages with the world. We are currently in the “Dispensation of Grace” according to this belief system. In the history of Christianity, it’s practically brand spanking new, being invented in the 1830s by a fundamentalist/restorationist Christian sect in Scotland called the Plymouth Brethren.
The pre-tribulation rapture belief comes from Dispensationalism and was not known in any part of Christendom before the Plymouth Brethren (or possibly the Irvingites – see immediately below) invented it.
Some scholars have traced the pretribulation-rapture belief to a “divine revelation” received by a member of an 1830s proto-Pentecostal sect in Scotland, the Catholic Apostolic Church (a/k/a the Irvingites), which belief was picked up by the Plymouth Brethren’s John Darby, tacked onto his emerging Dispensationalism theory, and claimed as his own.
What is Dispensationalism? – John MacArthur
Video by John MacArthur
Covenantalism vs Dispensationalism | Ferguson, Lawson, Sproul Jr, Sproul Sr, and Godfrey
Video by Ferguson, Lawson, Sproul Jr, Sproul Sr, and Godfrey