What program resumes if you take the Church out of the picture?
The Old Testament program resumes, including God's dealings with Israel: the coming of the Messiah, the tribulation, the King, and the Kingdom. The Body of Christ must be off the scene before God can pick up dealing with Israel, so once the Church is removed, that program continues.
Les teaches that if you could pull a slight of hand and remove the section on the Body of Christ, backing it up to the earlier point, you would come right back to the Old Testament economy: the coming of the Messiah, the tribulation, the King, and the Kingdom. He explains that since Israel rejected the Messiah, God brought up the Apostle Paul and began calling out the Body of Christ, primarily from among the Gentiles. That calling has nothing to do with the Old Testament program or the tribulation, which is tied primarily to the Jew. The Body of Christ is insulated from God's dealings with Israel, either before or after, so it must be raptured off the scene before God can pick up dealing with Israel again. Then He will yet bring in the tribulation to Israel.