Christ coming in the flesh 2000 years ago was something God had to do to provide us an out and give us freedom from our sins; recognizing this is something that we do not spend enough time doing and not accepting it dooms us to Satan and hell.
What Christ did works; He came here in the flesh and faced every temptation that Satan could throw at Him. Even at His weakest moment after forty days and forty nights of fasting, He remained without spot. Doing this and shedding His Blood gives us this out from sin that we so badly need. Hebrews 2:14 KJV showing the action He took destroying the power of death, Satan and sin:
Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
We too accepted being partakers of the flesh and we can also expect being attacked by Satan at our weakest point. God only expects us to do our best to resist and accept His Sacrifice by seeking forgiveness for our sins… Past and present. His defeating the power of death makes this work.
And “Death” is one of the names that scripture uses for Satan because it describes him; He represents sin and sin leads us to a spiritual death.
In addition to recognizing and accepting that Christ did this for us, Hebrews 9:14 KJV lets us know that we still have work to do and purging sin from our conscience and serving God is that work:
How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
Hebrews 9:15 KJV shows that the purging of sin applies to every sin that we ever committed, those now in New Testament times and those stored in our souls that take us back to the beginning:
And for this cause he is the mediator of the New Testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
Redemption is freeing us by totally releasing us from our transgressions; Hebrews 9:26 KJV shows how much we owe God for giving us this out:
For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.
You may notice that the out we are talking about reaches all the way back to the foundations of the world. Knowing when