Bob,
Isaiah 49: 3-7 says “And He said to me, ‘You are My servant, O Israel, in whom I will be glorified.’ Then I said, ’ I have labored in vain, I have spent My strength for nothing and in vain; yet surely my just reward is with the lord, and my work with my God. And now the Lord says , who formed Me from the womb to be His servant, to bring Jacob back to Him, so that Israel is gathered to Him( for I shall be glorious in the eyes of the Lord, and My God shall be my strength)…”
Isaiah 66:2 'But on this one I will look; on him ho is poor and of a contrite spirit, and who trembles at My word."
Isaiah 61:6-7 " But you shall be named the Priests of the Lord, men shall call you the Servants of our God. You shall eat the riches of the Gentiles, and in their glory you shall boast. instead of your shame you shall have double honor, and instead of confusion they shall rejoice in their portion…"
Isaiah was speaking of himself and others like him, who were following the Spirit.
As it says in Hebrews 11 of those who lived by faith in the Spirit. 36 “still others had trials of mockings, and scourging, yes and of chains and imprisonments. They were stoned , they were sawn in two, were tempted, were slain with the sword… of whom the world was not worthy…”
Many did recognize Jesus as a man who represented the God they believed in.
You assume that all the people of Israel believed in the Levitical law as covenant and the word of God. However, this was not the case.