True, but they will be regrafted in to the tree(God) according to Romans 11.
This will happen when Jesus returns to earth at His 2nd coming....
Rom 11:23 And they also, if they abide not still in unbelief, shall be grafted in: for God is able to graft them in again.
(they as a nation WILL believe and ALL be saved when Jesus appears the 2nd time as verse 26 below states)
24 For if thou wert cut out of the olive tree which is wild by nature, and wert grafted contrary to nature into a good olive tree: how much more shall these, which be the natural branches, be grafted into their own olive tree?
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26
And so all Israel shall be saved: as it is written,
There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this is my covenant unto them, when I shall take away their sins.
28 As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the father's sakes.
29 For the gifts and calling of God are without repentance.