Scripture is always true. Christ said of the Jewish leaders of His day,
“But ye believe not, because ye are not of my sheep, as I said unto you.”, John 10:26
We know from history and the Jew’s own admission in John 8 that most of the Jewish leaders of Christ’s day were of Esau/Edom whom God hates.
Today’s Jews include Esau/Edom. “Edom is in modern Jewry”, The Jewish Encyclopedia.
Remember your grandparents or uncles telling stories about Jews? I remember hearing about two Jews fighting over a penny making the first wire. Those stories were not told to be mean. They were told to teach a warning to the children about the continual behavior of the Jews. They do not share Christian morals.
Christ didn’t say they couldn’t believe because they had not become sheep. Christ said they could not believe because they were not and are not sheep. The modern day Jews are not Israelites. Christ’s word is always true.
John 10:27 “My sheep hear my voice, and I know them, and they follow me.”