I too have had a hard time with the ransom sacrifice.
It's rather like paying cash into an ATM, receiving a receipt for it but NOT seeing the balance on the screen.
Jesus died 2,000 years ago. All the miracles performed died with him. All the people he healed and resurrected died.
As you said, a sacrifice is something permanent.
Maybe Jehovah already planned to wipe out mankind after Adam and Eve sinned and Jesus said "Please Father, I will do ANYTHING to save the human race, I will give my life up for them."
"Ok Son, in 4,000 years time you can do this."
Now, I mean no disrespect to Jehovah or his Son, but what ARE we waiting for? The price has been paid? How many BILLIONS of people have died since 33 CE?