You know who is also under a curse? EVERY HUMAN who has not yet accepted Christ, repented of their sins, and made Jesus the Lord of their lives.
Jews don't have an exclusive patent on having a broken (covenant) relationship with God. If you are not growing in repentance, grace, love, and concern for the things of God, you're just as likely to be dead spiritually as any Jewish person who has not yet come to terms with his/her Messiah, Jesus Christ.
It is not wise to assume that "duh Joos" are beyond redemption, while neglecting your own personal relationship with God.
Romans 10:11-13
It is just as the Scripture says: “Anyone who believes in Him will never be put to shame.”
For there is no difference between Jew and Gentile: The same Lord is Lord of all, and gives richly to all who call on Him,
for, “Everyone who calls on the name of the Lord will be saved.”