Jesus did not come to start his own religion, but rather he came as the Jewish Messiah of Judaism and he practiced Judaism by setting a sinless example of how to walk in obedience to the Torah and by spent his ministry teaching his followers how to obey it. In Acts 21:20-24, they were rejoicing that there were tens of thousands of Jews who were coming to faith who were all zealous for the Torah, and Paul planned to take steps to disprove false rumors that he was teaching against the Torah and to show that he continued to obey it, which means that Jews coming to faith were not ceasing to obey and that that from the beginning there were people who misunderstood Paul as teaching against obeying it. Furthermore, this means that there was a period of time between the resurrection of Jesus and the inclusion of Gentiles in Acts 10 that is estimated to be around 7-15 years during which all Christians were Torah observant Jews, so Christianity at its origin was the form of Judaism that recognized Jesus as its prophesied Messiah. In Acts 24:14, Paul confessed that according to The Way, which they call a sect, he worshiped the God of our fathers, believing everything laid down by the Law and written in the Prophets, so The Way could not be referring to a sect of a religion other than Judaism, and that is the religion that Paul continue to practice as a Torah observant Pharisee (Acts 23:6). The Nazarenes are Christians who continued to be Torah observant.
However, that has not been the standard doctrine that has been taught for most of Christianity, s Christianity branched off from its roots fairly early, which I think most likely had its start with Claudius' expulsion of the Jews from Rome in around 43-53 AD, and which Gentiles not wanting to come back under Jewish leadership upon their return, which led to meeting in house churches. The Early Church Fathers had some shockingly anti-Semitic things to say, so they did not understand the role of the Jews or of the Torah, but it is these sort of tensions between Christians and Jews who were not followers of Christ also caused the two groups to polarize. In Shabbat 116b, the Talmud speaks about an account between a rabbi and a Christian philosopher, where the rabbi countered them by referencing Matthew 5:17, which is still a familiar conversation that is being had today.
Growing up I was taught to have an extremely negative view of the Torah, so I understand why that is a mainstream view within in Christianity because that is what they are taught, but through studying the Jewish cultural and historical context of the Bible, I became aware of how the NT is systematically interpreted with a negative slant towards the Torah. In Psalms 1:1-2, blessed are those who delight in the Torah of the Lord and who meditate on it day and night, and I even had these verses memorized as a kid, for some reason it just did not click earlier that the extremely negative view of the Torah that I had been taught was the opposite of the extremely positive view of it that is expressed in the Psalms, and if I was going to continue to believe that the Psalms are Scripture, then I needed to align my view of the Torah with them. The NT authors certainly considered the Psalms to be Scripture, especially with them being the OT book that is most quoted in the NT, so it is not unreasonable to think that they were in complete agreement with everything the Psalms say about the Torah, so I experimented with interpreting the NT as though that were the case and I found that it made much more sense and had much more continuity than I had given it credit for. So I reached the conclusion that the negative view of the Torah that I had been taught was wrong, and this has landed me in a position that is contrary to what is taught by most of Christianity, which is not something that I do lightly, but my choice has been increasingly affirmed. So I now use agreement with the Psalms as a test to determine whether someone has a correct view of the Torah.
In Jeremiah 31:33, it directly states that the New Covenant involves God putting the Torah in our minds and writing it on our hearts, so I no longer see why people think that the New Covenant does not involve obeying it. People should be quicker to think that the NT doesn't make sense and that they must have misunderstood it than to think that it makes perfect sense to interpret as speaking against obeying what God has commanded as if obedience to God were somehow a negative thing when all throughout the Bible, it calls for people to repent and to return to obedience to God, and even Jesus began his ministry with that Gospel message (Matthew 4:17-23).