There are 34 other books in the Old Testament, including many prophetic books that are completely ignored but are essential to understanding the nature of God.
I didn't say that every one of Israel rejected God...
Yet I have left me seven thousand in Israel, all the knees which have not bowed unto Baal, and every mouth which hath not kissed him.
Only that the same arguments used to reject Jesus's Lordship could have-and were-used to reject the teachings of Moses, and the prophecies of Jeremiah and Micah and Hosea and other men sent by God to warn Israel and Judah.
You can't observe the Law today. Even if the Temple existed, it would still be impossible.
Even observing the 10 Commandments is impossible without a personal relationship with God.
I feel your love for your pastor and community who told you Jews can’t keep the Torah (G-d forbid) and your love of your personal god whose picture you’ve seen on a wall, contrary to the Ten Commandments you reference.