I agree that the idea that God needed the sacrifice of Jesus to make God forgive us is not true, because it does not exist. God the Father so loved the world, humanity, that the Father sent the Son the show the Way of Life to humanity, so that whoever believes in the Son will have Eternal Life.
The Son came not to force the Father to do something the Father did not want to do. The Son came in order that humans might do something that they could not do on their own, know ins experience God, Father, Son, and Holy Spirit. Jesus was born, therefore He had to die, so just coming for us meant He died for us.
However, as the Messiah Jesus was caught on the horns of a dilemma. If He fulfilled the hopes and desires of the Jews, God's people, which was to set us His Kingdom as Israel, that would have meant a long and very ugly war with Rome. See the Jewish rebellions which took place shortly after His death.
On the other hand Jesus came as the Messiah or Savior not only for the Jews, but for the Romans, Greeks, and other Gentiles. Therefore Jesus died on a Roman cross as the Messiah of all humanity, Who came to save us all from sin, hatred, and spiritual death. This is why His death is important and not what you want to say.
To me this is not about material immortality as only a fool would want it to be about that. Material immortality is a wish of the selfish.
I am not certain I understand you here, but I think I do. It is very important that Christians assert that life is three dimensional, body, mind, and spirit, because it is important to know that saved humans live eternally as body, mind, and spirit with Jesus Christ in heaven.
It is not selfish to want to be comfortable, though it is selfish to be comfortable at the expense of others. It is not selfish to want to know the Truth, but not to look down at others. It is not selfish to try to be good, but not again to look down at others.
God wants humans to be fulfilled, physically, mentally, and spiritually. That is why the Father sent the Son to save us through the Holy Spirit. Salvation is fulfillment of the Image of God that God created us for, not its denial. Salvation is the found in the denial of human half truths and the acceptance of Gods Love as found in Jesus Christ.
Jesus came to reconcile people to God, Who is the Source of Love and Eternal Life. I think you got than right. However this has little to do with Socrates except he knew like most of us know that there is more to life than the physical.