If it was just blood, period, like the Aztecs, that would be one thing. They had different grades of blood— royal blood was more potent than blood from prisoners-- but it’s power comes from the fact that it represents life, rather than being just a bodily fluid like “tears” or “stomach acid” or “spit.”
But God doesn’t just want blood, and blood isn’t just what Jesus offered. We run into it time after time after time–
You do not delight in sacrifice, or I would bring it; you do not take pleasure in burnt offerings.
My sacrifice, O God, is a broken spirit; a broken and contrite heart you, God, will not despise.
May it please you to prosper Zion, to build up the walls of Jerusalem.
Then you will delight in the sacrifices of the righteous, in burnt offerings offered whole; then bulls will be offered on your altar.
So, step 1 is to reject evil and align your life to the principles that God has spelled out— not prioritizing other things besides God; loving your neighbor as yourself; not swearing falsely; keeping the Sabbath; honoring parents; not committing murder or adultery; not stealing; not bearing false witness; not coveting; etc.
If you don’t do Step 1 first, then you end up with scenes like–
"I hate, I despise your religious festivals; your assemblies are a stench to me.
Even though you bring me burnt offerings and grain offerings, I will not accept them. Though you bring choice fellowship offerings, I will have no regard for them.
Away with the noise of your songs! I will not listen to the music of your harps.
But let justice roll on like a river, righteousness like a never-failing stream!
And by the time you get to Jesus, if all he had to do was “shed blood to make God happy”, he could have been slaughtered by Herod as a baby, and be done with it. But he chose to stay on earth for 33 years, and spent 3 years in public ministry, before you get to the blood part. So what was important enough about those 3 years that made him stick around?
He stepped things up. He showed us not only how to live Step 1, but how to live the advanced version of step 1: You don’t just “not commit murder”, but you “turn the other cheek”. You don’t just “not commit adultery”, but you “don’t even think about it.” It’s all about interior rightness, not just refraining from doing wrong physically.
Can you list five people you know who have gotten his message down pat and reflected it in their lives perfectly? Then maybe one of those people is advanced enough to criticize the barbarity of the blood part. But it’s not me, and I have doubts that it’s you, either…