Somehow, the whole body of theology changed at the cross. Forgetting that God does not change. Ever since the Fall sin has existed, passed down to all mankind.
Sin brings death.
The solution has always been, the substitutionary sacrifice of Jesus Christ on the cross. Man's access to God is by faith in God's gracious mercy extended to us through Christ. Only time has changed. Israel and the Church. When Israel rejected their Messiah, the gospel was given to the Gentiles for a period of time.