Ezekiel 18 is just saying that if someone lives wickedly they will die. If their son lives wickedly their son will die, but they won’t. If people turn and do what is right, they will live. That’s all its saying. To try to take this and apply it to the Doctrine of the Atonement is just really way far out there. If you want to understand the Atonement, try Isaiah 53 if you like, but mainly the New Testament Epistles, for in them Christ reveals through the Apostles the mystery which had been hidden until then, of how salvation comes to the Gentiles through faith in his atoning death on the cross.

John 3:16- For God so loved the world, that he gave us his only Son that whosoever believeth in Him should not perish but have everlasting life. Romans 6:23 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.