By living a sinless life Jesus has opened the way of salvation from death. Jesus is currently in Heaven, on God's right hand. He will one day return. When he returns he will rule the earth and give immortality to those who have tried to follow him and do the will of God. His followers will help him to rule.
Man is mortal, having no existence when dead.
The reward for the faithful is eternal life on earth after Christ's return. Baptism is essential to gain this eternal life.