What are some ways that the theme of national inheritance in Joshua apply to Christians today?
The theme of national inheritance in the book of Joshua is an important topic and has many applications for us as Christians today, because the promise of the land was only partially fulfilled in the days of Joshua. That is, the land which the Lord promised Abraham was not geographically limited to the land of Canaan, as we see in the book of Joshua. We read in Romans 4:13: “For the promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith.” Here Paul tells us that Abraham will inherit the world — the entire world! … And these promises are fulfilled to the Gentiles too, who aren’t the offspring of Abraham in the flesh, but receive these promises by faith in Christ, who is himself Abraham’s offspring. So, what Abraham received and what Israel received in the days of Joshua was a small picture of a greater, larger, and more complete land that God promised to Abraham, fulfilled in Christ, and will completely fulfill in Christ’s second coming. Eventually, when Christ comes back he won’t only reign in Canaan, but he will reign and inherit the whole earth — the new earth and the new heavens — and we will reign with Christ forever.