What is the relationship of Israel to the Church?

Israel today lives in rebellion, because they reject Christ as Messiah. They are no better than their enemies. They remind me of Israel in times of Jeremiah, living in sin.
Except for few Jews that have been saved by grace by faith in Jesus Christ.

Many Christian wrongly believe that if they bless Israel today God will bless them. But Israel lives in sin, and God does not bless sin. The blessing from genesis 12 is for seed of Abraham. Seed of Abraham is Christ, and those who are in Him. Not those who live in rebellion.
So many Christians send money to Jews thinking God will bless them. But Jews need the Gospel of Jesus Christ.

God today only has one people. A sinner was, is and always will be saved only by geniune faith in Messiah, and that is Jesus Christ.

Now, it is true God still has plan for Israel. As prophet Zachariah says, one third will be saved, but they will go through the Great Tribulation. This is the remnant of Israel described in Romans 11.

Remember. Not all Israel is Israel. The true Israel are believers in Jesus Christ. Now ofc that does not mean the Church has replaced Israel, by no means!

Also, many Christians are looking forward to the third temple. But God is done with physical temples. The Church is the temple of God now. The temples that were before, the holy of hollies, could only be entered by a High Priest once a year, and there was a vail that separated us. Christ is the true High Prist now. Through Him we have constant access to God, and He got away with the vail. But seems like some one to tragically want to go back. The third temple is not for God, it will be for the antichrist!