The evangelical church in 19th century England and the United States saw the rise of dispensationalism. It constituted a comprehensive hermeneutics (way of interpreting the Bible), but for our purposes it’s important to understand that it divided the Bible into two separate messages: one message to the nation of Israel, and another message to the Gentile church. The Jews were considered to be God’s earthly people, and the church his heavenly people. God’s promises to the Jews were for this world, and his promises to the church were for the eternal world. The Bible itself was deemed a dual book. The OT and parts of the NT were given to Israel. Much of the NT, and particularly Paul’s epistles, were given to the church. Among other things, this meant that the NT promises to the church, which assumed the OT promises to the Jews, had to be cut off from the OT, which was a Jewish book. The gospel promises are for personal victory and our future home in heaven. They have nothing to do with God’s redeeming the entire creation by his Son’s death and resurrection. This earthly victory could only happen by the enforced kingdom during the centralized government of the future millennium during which Jesus literally rules in Jerusalem over the Jews. The Gentile church by that time would be far away in heaven, having been raptured away from the earth.
The dispensational gospel is the Gentile gospel, and the Gentile gospel saves individuals from sin and prepares them to meet the Lord. The Jewish gospel includes restoring ethnic Israel to her God-given land of Canaan and overspreading the earth and its nations with Jewish blessings. This will all be delayed until the future millennium.
This dualistic hermeneutic divides what God unites. The Bible teaches the unity of God’s purposes. God’s gospel and the law and covenant and promises come to their fulfillment in Jesus Christ. All of those who trust in Jesus Christ are the heirs of the biblical promises, both the OT and NT (Eph. 2:11–13; Gal. 3:25–29). But if you believe the dispensational, dualized gospel, while you might understand the basics of our Lord’s death and resurrection and our future home with the Lord, you won’t understand the unified, comprehensive gospel of the Bible.
And this misunderstanding is precisely what has dominated much of evangelicalism for the last few generations. It explains why for many decades large swaths of evangelicalism did not engage politics, did not care much for creation, did not develop (or preserve) a distinctly Christian view of education, did not enjoy many of the blessings of the created order (labeling them “worldly”), and did not plan for a long-term Gospel victory in time and history.
The blame for the present cultural disenfranchisement of Christianity can be laid partly at the feet of dispensationalism.