The first question is:
WHY was it necessary for Jesus to die?
What could the death of Jesus achieve that an almighty God could not have achieved without bloodshed, just with one snap of those omnipotent fingers?
The second question is:
WHAT did Jesus’ death actually achieve? What, specifically, was different afterwards, that wasn’t so before?
The third question is:
Since God had made [his] covenant with the Jews, and was the God of the Jewish nation, and the only God, and had never needed an intermediary,
why would God suddenly need an intermediary in the first century CE?
Grateful for illumination.
I have studied this question in depth, not for you or this forum, but for myself. You challenged me. I don't expect this will make any sense
to you.
The bible declares we are natural - 'of the clay' and 'akin to the animals.' And we are spiritual - the 'breath of life' and have 'living souls'
which returns to God at death.
Flesh and spirit in conflict, symbolized by the rival brothers Isaac and Ishmael, Cain and Abel, Jacob and Esau. 'First born' symbolizes
human nature - what we are born with.
In Exodus 12 Hebrews took an unblemished male lamb into their homes for three days (where they would likely bond with it) then killed it.
They ate it whole - its head, legs and 'inner parts.' Its blood was daubed on the lintel and door. That night the 'death angel' passed over
Egypt. The 'first born' of every household would die without this blood sign.
We have the Old Testament because of its symbolic language. In reading about Jesus as the Lamb of God the OT has explanatory power,
and context. Thus we can understand the sacrificial animals, Promised land, priesthood, altar, God's chosen people, Egypt, the Pilgrimage
and the eternal city.
But everything Jesus Himself did was also symbolic. He came to be the 'lamb of God' who was 'slain from the foundation of the world.'
Whoever loved Him enough to die to their first born nature would be 'covered' by his sacrifice, brought out of Egypt and saved from death.
You must 'eat' all of the lamb. Not just parts which appeal, as many Christian religions chose to do. Jesus isn't all about healing and loving
children.
This is all symbolic language. Symbolism on top of symbolism.
So we better understand, ie to 'show the Lord's death till he comes'
And
'a corn of wheat dying brings forth much fruit'
And
'dying daily' to self and the world.
Those who left everything for Christ died to their former selves.
This struck many people - if a man or woman gave up literally everything they had, or were even facing death, then this must be
very important.
Snapping of the finger to atone for sin trivializes sin.
The power of Christ's suffering and death lies in its symbolism of the severity of sin, the brevity of life, the rejected world,
overcoming our nature, the perspective death give us of our brief life.