the dispies are the real replacement theology people. they replace the one seed which is Christ with many seeds. the one people of God with two people of God.
The proof that the seed is Christ is in
Genesis 15:18.
In the same day the LORD made a covenant with Abram, saying, Unto thy seed (τω σπέρματί σου, LXX) have I given this land, from the river of Egypt unto the great river, the river Euphrates: Genesis 15:18
besides Paul saying so in
Galatians 3:16
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed (τω σπέρματί σου), which is Christ. Galatians 3:16
Now if someone has a skeptical or disbelieving heart about what Paul said due to dispensational hypnosis, here is proof that Paul was correct (of course a disbelieving heart won't believe this either, but I digress).
In Genesis 15:7 God promises to give the land of Canaan to Abraham. Abraham then asks for assurance. What's interesting about this exchange is that Abraham didn't just believe God; he asked him for a guarantee, ie, surety. And God didn't just say he would give him the land; he said Abraham would inherit it. But from whom?
And he said to him, I [am] the God leading you from out of [the] place of [the] Chaldeans, so as to give to you this land to inherit. And he said, Lord YHWH, how will I know that I will inherit it? Genesis 15:7-8
In response God told Abraham to make preparations for a blood covenant, the most solemn vow existent, which Abraham did. Then God walked through the animal pieces sealing the blood covenant with Abraham
In that day YHWH cut a covenant with Abram, saying, [To] your seed I will give this land, from the river of Egypt unto the river of the great Euphrates, Genesis 15:18
Now if God promised to give Abraham the land as an inheritance, and then sealed that promise with a blood covenant in which he committed himself to giving the land to Abraham's descendents, how could that have been any assurance to Abraham that he would indeed receive the land? For he would die and they would die, and he could receive nothing from them. Plus receiving an inheritance from one's descendents is just an absurd idea.
However, if God committed himself to giving the land to Christ, which he did, and Abraham knew that God was speaking of Christ, which he did, then he would have rock solid assurance that he would receive the promised land as an inheritance from Christ in the resurrection.
Your father Abraham rejoiced to see my day: and he saw [it], and was glad. John 8:56
So Paul was right. Have a believing heart and believe what is written in scripture
Let us therefore fear, lest, a promise being left [us] of entering into his rest, any of you should seem to come short of it. For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard [it]. Hebrews 4:1-2