Thanks for pointing this out. Yes, my statement was an over generalisation. I believe that the OT saints, Abraham, Isaac, Jacob, the true prophets, Moses, Joshua and Caleb were born again. However, what they did not have was the indwelling Holy Spirit as believers have today. The Holy Spirit came upon them from time to time. Samson is a good example.
Most Israelis were not born again as witnessed by their utter unwillingness to obey God's law. It was not too hard, according to God. But the unregenerate heart is deceitful above all things and desperately wicked.