"For if by the trespass of the one man death ruled as king through that one, how much more will those who receive the abundance of the undeserved kindness and of the free gift of righteousness rule as kings in life through the one person, Jesus Christ!" Romans 5:17
"For the wages sin pays is death, but the gift God gives is everlasting life by Christ Jesus our Lord." Romans 6:23
"For just as in Adam all are dying, so also in the Christ all will be made alive." 1 Corinthians 15:22
How could the death of one man bring life to millions? Paul gives a logical answer to that question. He draws a contrast between what Adam brought on mankind and what is possible through Christ. With regard to Adam, Paul wrote: “Death came through a man.” When Adam sinned, he brought disaster on himself and his descendants. We still feel the tragic effects of his disobedience. How different is the outcome made possible because God raised his Son! “Resurrection of the dead also comes through a man,” Jesus. “For just as in Adam all are dying,” Paul reasoned, “so also in the Christ all will be made alive.”—
1 Cor. 15:21, 22.
https://wol.jw.org/en/wol/d/r1/lp-e/2020680