A: Since death is the punishment for sin, Christ died willingly in our place to deliver us from the power and penalty of sin and bring us back to God. By His substitutionary atoning death, He alone redeems us from hell and gains for us forgiveness of sin, righteousness, and everlasting life.
Heidelberg Catechism, Q43: What Further Benefit Do We Receive from the Sacrifice and Death of Christ on the Cross? That by virtue thereof, our old man is crucified, dead and buried with Him; that so the corrupt inclinations of the flesh may no more reign in us; but that we may offer ourselves unto Him a sacrifice of thanksgiving.
Westminster Confession of Faith, Chapter VIII: Of Christ the Mediator, Paragraph V The Lord Jesus, by His perfect obedience, and sacrifice of Himself, which He through the eternal Spirit, once offered up unto God, has fully satisfied the justice of His Father; and purchased, not only reconciliation, but an everlasting inheritance in the kingdom of heaven, for those whom the Father has given unto Him.
Belgic Confession, Article 20: The Justice and Mercy of God in Christ We believe that God -- who is perfectly merciful and also very just -- sent His Son to assume the nature in which the disobedience had been committed, in order to bear in it the punishment of sin by His most bitter passion and death. So God made known His justice toward His Son, who was charged with our sin, and He poured out His goodness and mercy on us, who are guilty and worthy of damnation, giving to us His Son to die, by a most perfect love, and raising Him to life for our justification, in order that by Him we might have immortality and eternal life.
A: Christ triumphed over sin and death by being physically resurrected, so that all who trust in Him are raised to new life in this world and to everlasting life in the world to come. Just as we will one day be resurrected, so this world will one day be restored. But those who do not trust in Christ will be raised to everlasting death.
Heidelberg Catechism, Q45: What Does the Resurrection of Christ Profit Us? First, by His resurrection He has overcome death, that He might make us partakers of that righteousness which He had purchased for us by His death; secondly, we are also by His power raised up to a new life; and lastly, the resurrection of Christ is a sure pledge of our blessed resurrection.
A: Christ rose bodily from the grave on the third day after His death and is seated at the right hand of the Father, ruling His kingdom and interceding for us, until He returns to judge and renew the whole world.
Westminster Shorter Catechism, Q28: Wherein Consists Christ's Exaltation? Christ’s exaltation consists in His rising again from the dead on the third day, in ascending up into heaven, in sitting at the right hand of God the Father, and in coming to judge the world at the last day.