The Jews since Christ’s times were not true to the Holy writings.
Judaism is not based on “the Holy writings” as you put it. Judaism existed before there was a collection of Scriptures. The first canon of Scriptures was devised not by Jews but by Christians.
In fact, the first man to do so was Marcion of Sinope (85-160 C.E.), a bishop, who was on the verge of heresy, attempting to merge Christian thought with the Gnosticism that was infiltrating the Church at the time. Gnostics believed that salvation was possible only through divine wisdom that came from a select enlightened few, but Marcion also believed that it could be dispersed through holy writings. So he devised a “rule” (in Greek “kanon”) of select books from which to gain true “knowledge” (gnosis). Marcion rejected all Jewish teachings, including the Torah, the teachings of the Prophets, and accepted only selected written works of the Apostle Paul and Marcion’s own edited version of the Gospel of Luke. This was the first “canon” of Scripture that was used to base religious teaching from in the history of Judeo-Christianity. Marcion soon found himself excommunicated by the Church for this.
But he did raise a question in both the Church and Judaism. Was there a codifiable list of texts that could be approved as sacred texts, viewed specifically as the Word of God above all others? Outside of the Ten Commandments, there had never been a “rule” or canonization of texts in Judaism or Christianity. The Church was the first to begin work on this question.
A “fluid canon” of the texts of the Torah, the Prophets, and the Writings of Judaism had existed since 200 B.C.E., but the religion of Judaism is far older than its writings. It is not based on these writings. In fact, the writings themselves are based on the religion, and the Jewish canon was not officially set until the time of the Masoretic Text’s completion, between the 7th and 10th century C.E.
As for the Christian canon, the Church had mostly come to an agreement by the late 4th or early 5th century, by which time most in the East and Western communities had finally agreed on accepting Revelation into the canon, one of the most debated of the books. Again, like Judaism, the Christian community–the Church–came first, not the Book or New Testament. The religion is not based on the writings. The writings are based on the religion,
Christ Jesus denounced the Pharisees and Sadducees publicly for their deviation from the commandments of יְהֹוָה , as the Mishnah which stores recorded tradition to overstep the Law.
The Mishnah was not composed until
after Jesus died. And thus some of the practices that are being argued about between Jesus and the Pharisees and Sadducees in the Gospel accounts are anachronisms as a result. You are obviously unaware of that.