Our spirits are saved when we confess Jesus as Lord and get baptised, and this grants us a relationship with Jesus, and means we go to Heaven.
However, there is so much more than this. God’s Kindgom is a kingdom, with power and authority and structure!
Our time here on earth, apart from preaching the good news etc, is also about proving our character (do we give in to the enemy, or do we overcome via grace and faith?). The time we spend on earth now shows how trustworthy we acutally are and therefore what position we are able to handle in God’s government.
Jesus won’t put anyone of bad character in charge of His Kingdom, and the only way our chatacters can be tested is when there are things against us to test us. In Heaven there will be no such tests – which is our time on earth is actually our job interview for the position we will take in Heaven.
Rev 20:6 “Blessed and holy are those who share in the first resurrection. The second death has no power over them, but they will be priests of God and of Christ and will reign with him for a thousand years. “