You really are quite confused about this whole subject.
The kingdom belongs to Christ but THE LAND was promised to the descendants of Abraham, Isaac, and Jacob -- the twelve tribes of Israel (Gen 15:18-21), In the same day the LORD made a covenant with Abram, saying, Unto thy seed [descendants] have I given this land, from the river of Egypt [the Nile] unto the great river, the river Euphrates: The Kenites, and the Kenizzites, and the Kadmonites, And the Hittites, and the Perizzites, and the Rephaims, And the Amorites, and the Canaanites, and the Girgashites, and the Jebusites.
This has never been fulfilled, but will be so after the Second Coming of Christ. And it will be only for believing Jews at that time.