Jesus Christ literally arose from the dead after three days, in a new physical resurrected body. Jesus saved us because of His mercy, not because we deserved it. There is one mediator between God and man - Jesus Christ. As a result of Jesus' sacrifice, salvation is available to all mankind. Jesus finished the work of salvation on Calvary.
Nothing remains to be done to obtain salvation.
Salvation is a free gift from God, not something we can earn. To obtain salvation a person must be born again , i.e., born spiritually. If a person accepts Jesus as his savior, God will forgive the person's sins and when the person dies God will give him great rewards, including eternal life. If a person refuses to accept Jesus, the person will be punished forever after he dies. It is not enough to believe in Jehovah.