BayouHuguenot on the Puritan Board summarizes arguments made by Vanderwaal in Hal Lindsey and Biblical Prophecy:
Odd problems in dispensationalism: if the church age will end, and if there will be believers in the Tribulation, then the church isn’t the mother of believers. We await another mother, a Jewish one (30).
Another odd problem: One of the weirder problems in Gogology is that many Russians converted to Judaism in the Middle Ages, which means a lot of Jews in Eastern Europe have Russian blood. Now, Israel = Gog!