God did not reject His people, whom He foreknew. Do you not know what the Scripture says about Elijah, how he appealed to God against Israel:
Textus Receptus (TR) - Romans 11:2 >Οὐκ ἀπώσατο ὁ Θεὸς τὸν λαὸν αὐτοῦ ὃν προέγνω. Ἢ οὐκ οἴδατε ἐν Ἠλίᾳ τί λέγει ἡ γραφή; Ὡς ἐντυγχάνει τῷ Θεῷ κατὰ τοῦ Ἰσραήλ, λέγων,