Jesus gave up his life as God had already planned , he died the most dreadful death ever, not only that he took the sins of the whole world into his shoulders .
Therefore the death and resurrection of our Lord Jesus was necessary for us to be reconciled back to God, no death and resurrection of Jesus...there would also be no new birth/ Born Again/ Born of the Spirit.
We would still be in darkness and sins.
Romans 5:10
“For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.”