Satan is cruel and heartless, he not only brought down Adam and Eve into sin and death but accuses their descendants of sinning before God. Revelation 12:10 "And I heard a loud voice in heaven, saying, "Now the salvation the power and the kingdom of our God and the authority of his Christ have come, for the accuser of our brothers has been thrown down, who accuses them day and night before our God." Zechariah 3:1 "Then he showed me Joshua the high priest standing before the angel of the LORD, and Satan standing at his right hand to accuse him." Satan uses accusation to create condemnation and shame, making us feel that we could never be forgiven. He creates a feeling of hopelessness that we will always be sinners deserving of death. Even before Jesus Christ's death and resurrection, Satan used the power of death to bring people down.
God saw what Satan was doing to his people. He saw that his people needed a redeemer. They needed to be freed from the sin and death that Adam and Eve brought upon them. God sent Jesus Christ his only begotten son so to free us. Romans 5:18-19 "Therefore, as one trespass led to condemnation for all men, so one act of righteousness leads to justification and life for all men. For as by the one man's disobedience the many will be made sinners, so by the one's obedience the many will be righteous." 1 Corinthians 15:21-22 "For as by a man came death, by a man has come also the resurrection of the dead. For as in Adam all die, so also in Christ shall all be made alive."
Even though Satan may still try to accuse us, we now have Jesus Christ to intercede on our behalf. Romans 8:33-34 "Who shall bring any charge against God's elect? It is God who justifies. Who is to condemn? Christ Jesus is the one who died--more than that, who was raised-- who is at the right hand of God, who indeed is interceding for us." Jesus Christ sacrifice justified us before God. 2 Corinthians 5:21 "For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God." Romans 5:1 "Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ."
Satan accusations against us are being brought to nothing. God as forgiven our sins so the devil cannot not use our sins against us. Jesus Christ has release us from the fear of death by opening up the gates of heaven. We have hope and we have salvation. Our future is secured in our belief in Jesus Christ. One day we will all be standing in God's kingdom.