Not all people who believe in life after death would call themselves religious.
For example, some people believe in the concept of reincarnation who are not necessarily Buddhist, Hindu or Sikh. Others feel natural justice requires good to be rewarded and evil to be punished, but they do not hold one of the traditional faiths that promise an afterlife.
For some people, near-death experiences (NDEs), a sense of déjà vu or witnessing ghosts (perhaps through a medium) convince them there is life beyond death.
Christian beliefs about life after death are based on the resurrection of Jesus Christ.
Christians believe that Jesus’ death and resurrection are part of God’s divine plan for humankind. Through his death on the cross, Jesus pays the penalty for mankind’s sin. Mankind’s relationship with God is therefore restored. This is called atonement.
Christians believe that three days after the crucifixion, God raised Jesus from the dead and he once again appeared to his disciples. This is taken to mean that Jesus’ sacrifice was a victory over sin and death. Although physical death still happens, those who believe in Christ and live good lives will be given eternal life in Heaven.
Many Christians believe that after death they will be taken into the presence of God, and they will be judged for the deeds they have done or failed to do during their lifetime.
Some of the guiding principles for what will happen upon death include the following.
Some Christians believe that this judgement will happen when they die. Others believe that there will be a Day of Judgement at the end of time, when everybody will be judged. Some believe that judgement will happen in two stages - an initial personal judgement when you die, followed by the definitive judgement at the end of time.
Since God has given human beings free will, there must be an opportunity for people to reject God. This is the basis of the idea of Hell.
Hell has traditionally been depicted as a place of eternal fire that symbolises pain and suffering. This is seen as the result of the refusal to accept the happiness that God wants people to share with Him.