Jesus will soon return from heaven. He will establish the Kingdom of God on the earth. He will rule as King and his capital will be Jerusalem in the land of Israel. The Jews are God's witnesses to His purpose, even though many of them do not realise it. God made promises to Abraham and David which will be fulfilled when Jesus comes back.
Death is the punishment for sin and all men are sinners.
The only hope of life after death is bodily resurrection from the grave at the return of Jesus. There will be a judgement. Those who are faithful followers of Jesus will be given everlasting life and they will help him to solve the problems of the world and bring peace and blessing to all nations. We must believe the Gospel, repent from our sins and be baptized. If we keep trying hard to obey God's commands, and pray for forgiveness when we fail, then we shall be saved.