Of course Christians must know Torah. How else do we learn the perfect standard Jesus Christ (Yeshua HaMashiach) lived and taught, which reveals we are sinners and need of His spotless sacrifice. When Peter said we must walk in Jesus foot prints, he was referring to God’s standards. We find those standards not only in the NT but as Christ said:
Luke 24:44-49 NASB
Now He said to them, “These are My words which I spoke to you while I was still with you, that all things which are written about Me in the Law of Moses and the Prophets and the Psalms must be fulfilled.” Then He opened their minds to understand the Scriptures, and He said to them, “Thus it is written, that the Christ would suffer and rise again from the dead the third day, and that repentance for forgiveness of sins would be proclaimed in His name to all the nations, beginning from Jerusalem. You are witnesses of these things. And behold, I am sending forth the promise of My Father upon you; but you are to stay in the city until you are clothed with power from on high.”
Your belief in J*sus doesn't come from the Torah or the rest of the Hebrew Bible. It comes from the "new testament" and the assumption that its interpretation of the Hebrew Bible is authoritative.
Your belief that the "new testament" is authoritative does not come from anywhere in the Hebrew Bible. You assume it from the outset, therefore you assume from the outset that the Hebrew Bible means only what the "new testament" says it means.