Christians are the real Jews. And Christians do not believe in the Promised Land.

This is a massive question and I have no real idea but here summarise a small bit of reading and inject a source and question.

https://www.quora.com/Jesus-s-first-follower-were-Jewish-They-believed-he-was-the-Jewish-Messiah-Why-is-their-faith-considered-a-new-religion#:~:text=All%20of%20Jesus'%20first%20followers,that%20became%20a%20new%20religion. 

So it seems that after the destruction of the second temple 70AD when Jews could no longer sacrifice to God the religion split into the Pharisees who believed penitence and pray could replace sacrifice and the Messianic which believed that their bodies were the new temple when they received the Holy Spirit. 

Now this reference criticises Paul for allowing Gentiles to convert based only on faith while not having the observe the many rituals of Judaism.

However ever Christian knows that Jesus in many places says that Faith is all you need, and in Luke 22:20 at the Last Supper he says that he is the new covenant and elsewhere the fulfillment of the Law. In Jesus it is done past tense! He is the New. So Christians don't need the Old Testament or the Old Prophets or the old relationship with God. It is reborn in Jesus. So Judaism is essentially over for Christians.

Now did Jesus say this or is this Paul backing up his new "Judaism Lite". Well Luke was a companion of Paul who learned the gospel from Paul. So while Luke is considered to be telling an independent version of the story of Jesus I cannot see how it is not fundamentally Pauls version.

But Matthew was actually at the last supper and he gives the account of the New Covenant. So if Jesus is a New Covenant with God then Christians are Jews but don't need to follow the Law of Moses.

Now for me Matthew 15:28 carries one of the most important points in Christianity.

"Then Jesus said to her, “Woman, you have great faith! Your request is granted.” And her daughter was healed at that moment."

This woman is a Canaanite the original Stone Age inhabitants of Levant who existed in the area long before the Hebrews and Israelite tribes migrated. The Israelite tribes massacred most of the existing people when they invaded and I wonder if this is the start of the idea that it is okay to erase people and set yourself up in their place. If the world ever decides this is wrong then both the Jews and the Americans are in trouble as the worst offenders. Germans did not erase people and move in, they erased the people who had moved in!

So Jesus is saying to someone who is not even an Israelite that their faith has brought the gift of healing from God. This traditionally is when Jesus realises that God will honour anyone who has faith in Him not just ethnic Israelites (Jews).

So we discover through Jesus that Yahweh is the God of anyone who will follow Him. We already know this because many people followed Yahweh before even the Israelites took him as their God. Samaritans most famously worship Yahweh.

So there is no link between ethnicity and Yahweh.

It seems the main distinction Jews use to define themselves are observing the Law of Moses. This is why the comments in the Quora link strongly suggest that Jews do not think Paul's Christian Movement is Jewish.

But this misses the whole point of Jesus' teaching that God forms a relationship with his followers based only on faith.

So in fact arguably Christians are the true Jews and the existing religion of Judaism is a conservative sect still bound to an archaic interpretation of the relationship with God.

But this raises a question about the "Promised Land". This exists only in the Law of Moses. Jesus did not talk about this. If he completed the Law of Moses then this suggests the Promised Land Period also ends.

So Jesus and thereby Christians do not support the Promised Land or Israel. It is just the arguably obsolete belief of the original Covenant that exists on in the Pharisees sect.