A couple of terms were introduced, both of which color the system's view of eschatology.
(note: the descriptions, as I understand them, apply only to end times.)
Dispensationalism: all things are interpreted literally, all promises to Abraham and David are yet to be fulfilled (no promises have already been fulfilled)
Preterist: most of all prophecies concerning the end times have already been fulfilled.
Riddlebarger explains that neither of these views are correct.
When Scripture uses figurative language, interpret it figuratively. Dispensationalism takes the figurative and forces it into literalism.
Prophetic passages can also contain a "has passed, but has yet to come to pass" dual meaning.
Riddlebarger helps us understand that there were anti-Christ types before Jesus walked this earth, and that there have been many anti-Christs, and there will be more.
Therefore, since Antichrist has already come, remains with us today, and will come again, understanding the tension between the already and the not yet is the key to understanding what the doctrine of Antichrist actually entails, and understanding this tension enables us to know how we are to combat him.
Kim Riddlebarger. Man of Sin, The: Uncovering the Truth about the Antichrist (p. 36). Kindle Edition.