Redemption Christianity believes that human beings are born with "original sin" and cannot save themselves. Since man has committed a crime, he needs to pay a "ransom" to compensate, but he is unable to compensate himself. So God sent his son Jesus Christ to die for mankind and shed precious blood to atone for the sins of believers. "Only by believing in Jesus Christ can people be exempted from all sins." Fourthly, the theory of heaven and hell. Christianity believes that the real material world is sinful and limited, and the end of the world will come sooner or later. Both human body and life are short-lived, and will eventually die and pass away, while human soul is eternal. After death, his soul will decide whether to go to heaven or hell according to whether he believed in Jesus before his death.