It’s no surprise the most of the Jewish leadership especially don’t believe. God did after all “set the aside” during this age of grace. The abandonment of the Jews is coming to an end very soon. This “dispensation of grace” as Paul called it will soon end and God will once again turn His full attention to the nation of Israel.
“In 1992, powerful new evidence from the Dead Sea Scrolls was published that reveals the belief among first century mainstream Judaism that the Messiah was indeed the Son of God.”
And the Messianic/Completed Jews still believe that. Mr. GG2 being one of them.