Christs death and resurrection and the total failure of those Jewish people to recognize Jesus as the Messiah because they were so stuck on their tradition as Jesus showed and excoriated them for.
The “total” failure of his people to recognize Him? Were the Apostles, the many holy women, the many other disciples not Jews? Jesus celebrated the Pasch with his disciples—a liturgical act. And he told them to continue doing what he was doing with them that night.
You are flirting with Marcionism.