This does not say that as other cultures and other people have had their ideas of the afterlife, now the Christians have their ideas too. This is truth. These are the words of God's Son, risen from the dead. He that heareth My words, said Jesus, and believeth in them, hath life. This is to be embraced and believed because it is the testimony of God's dear Son.
Every believer knows that.
The hour of the resurrection of the body is coming. We know that by the wonder of spiritual rebirth today. We know that because through faith we experience that we have passed from death to life. Now we know also that the body, purchased by Jesus Christ through His suffering on the cross, shall be raised. The body is not a plaything of sin.