Perhaps you can tell us why you think that "blood" was essential to the Jewish worship under the Mosaic Covenant. After delivering the children of Israel from Egypt, the Lord brings them to Mount Sinai. There He warns them not to come near to Him. They must not even touch the base of the mountain:
"Take heed to yourselves, that ye go not up into the mount, or touch the border of it. Whosoever toucheth the mount shall be surely put to death" (Ex.19:12).
Let us examine the amazing changes that result from "blood". First an altar was set up and burnt-offerings were offered, and then the blood of the covenant was sprinkled upon the people:
"And Moses took the blood, and sprinkled it on the people, and said, Behold the blood of the covenant, which the Lord hath made with you concerning all these words" (Ex.24:8).
With the blood the nation was set aside as the Lord's special people and
"then went up Moses, and Aaron, Nadab, and Abihu, and seventy elders of Israel...and upon the nobles of the children of Israel He laid not His hand; also they saw God, and did eat and drink" (Ex.24:9,11). Then the Lord gives the command:
"Let Me make them a sanctuary; that I may dwell among them" (Ex.25:8).
Just the day before it would have been death if they would even touch the mount, but now they saw God, and they were at peace in His presence. In the day when the people were sprinkled with the blood of the covenant the nation of Israel was established as a holy people in covenant with God.
First of all, without the blood of the covenant the nation would not be in a covenant relationship with the Lord. And without that relationship then all of the different kinds of atonement under the Mosaic Covenant would not have been available to the chilren of Israel. So can we not understand that what is here is true?:
"And almost all things are by the law purged with blood; and without shedding of blood is no remission" (Heb.9:22).
The LORD must have had some reason for stressing the importance of "blood" or "death" in His relationship with man.
What would you say is the reason for that?