I see what you're saying about really hammering this concept into their realities. Is this just a mystery that we can't know, or am I missing something major?
Yes, you are missing something MAJOR! Wayseer too.
I'm not saying this is a "Salvation issue." We are not saved by our own understanding. But Paul said he yearned to know Him more, and prayed for others to receive the Spirit of wisdom and revelation in the knowledge of Him.
I can tell you
that (accompanied by in-depth study) is FAR better than just reading what somebody else has to say about it! So let me say, EVERY detail, of EVERY (Biblical) sacrifice, was accomplished in Christ's ONE sacrifice.
If you really want to understand who He is, once you've gleaned as much understanding out of the New Testament as you possibly can, realize that the details of who He is aren't spelled out until you do the same with the Old Testament. Those sacrifices are there for a reason, and learning what they all signify / accomplished in the Spirit is a very worthwhile undertaking!
It is not JUST symbolism, metaphor, etc. It was REAL. Also consider that all that reality vanished overnight with Christ's death, even in cultures that didn't hear the Gospel for centuries later. Very,
very few peoples continued any type of blood sacrifice for much after His death. (The main one was the Incas, seems they were Devil worshippers and completely wiped out)
Also consider that Cain and Abel weren't just having discussion over dinner like we might come here. Cain KNEW his sacrifice was rejected! It made a
real difference in his life, not some argument about how many angels fit on the head of a pin. The point being, pursuing this will make Christ more real in each of our lives.