Why did God set Israel aside and put her into dispersion?
Israel was set aside and dispersed because she rejected her Messiah, the King, and the Kingdom, thereby forfeiting the opportunity to evangelize the nations. God then turned to the Gentiles completely, apart from the nation of Israel, during a dispersion lasting over 1900 years, as part of the church age parenthetical period.
Les explains that all prophecy is connected with Israel, while no prophecy associates with the church. The church age is a parenthetical period slipped in between the prophetic program, and it is predominantly Gentile. Since Israel rejected her Messiah, the King, and the Kingdom, and the opportunity of evangelizing the nations was in the offing, God set Israel aside and put her out into a dispersion that has lasted over 1900 years. He then turned to the Gentiles completely without the nation of Israel. The Body of Christ is strictly a Pauline revelation, not found in the Old Testament or the Gospels.