Ephesians 2:12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:

In the Old Testament, the nation of Israel placed their faith in God, but because they had God in the world in a physical form, which they could witness, and because they had the Holy Spirit, within the inner sanctuary, they did not receive the Holy Ghost which is given under the New Testament by faith in Christ. Although, a few chosen Kings and Prophets did recieve it, it was not generally given (John 7:39) to the regenerate children of God, whether Jew or Gentile. This is why the Gentiles of the Old Testament were without God in the world and strangers from the covenants of promise, having no hope.