"But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God's grace and the gift that came by the grace of the one man, Jesus Christ, overflow to the many! Again, the gift of God is not like the result of the one man's (Adam's) sin: The judgment followed one sin and brought condemnation, but the gift followed many trespasses and brought justification. For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God's abundant provision of grace and the gift of righteousness reign in life through the one man, Jesus Christ." (Romans 5:15-17)
This is an often-repeated theme in the Bible: sin entered the world through Adam, bringing with it not only the physical manifestations of sin (sickness, death, war, etc.) but also spiritual death, which is eternal separation from God. However, God in His infinite mercy provided a way of atonement: Jesus Himself paid the price for our sin so that we may be made right with God. We in ourselves cannot possibly make things right, but Jesus has already done it for us!! We need only accept this gift. When we accept Jesus as Lord and Savior and become a Christ-follower, we are made right with God and will spend eternity with Him.