All Old Testament saints resurrected to be with Jesus after His ascension,and all New Testament saints are with Jesus,for to be absent from the body is to be present with the Lord.
When all the saints are gathered unto Jesus He will come back with all the saints in glorified bodies,and fight the world and defeat them,and rule for 1000 years on earth,which the LORD shall be King over all the earth,and in that day there shall be one LORD,and His name one.
The dead that never heard the word of God to accept it,or not sufficiently to accept it,along with those that rejected the word of God,are sleeping,which Jesus said this when He resurrected a dead girl and said she is asleep.
After the millennial reign of Christ on earth,the dead shall be raised and go to the great throne judgment.
Those that heard the word of God sufficiently and rejected it holding them accountable will not be able to be with God.
Creation testifies of a God and His attributes,which one of them is love,that loves people for He provided food,and the means to make clothing,and shelter,so they are without excuse,which is the universal law that covers the whole history of mankind,love God,and love people,for that is what it really is about.
Those who never heard the word of God,or not sufficiently,will be judged on their belief in a higher power,and their love for this higher power,and love for people,and their conscience,and if they did abide by that sufficiently,and asked God to forgive them if anything is amiss for they do not have the word of God,or heard not enough,and could not have the Spirit as the saints,then they can dwell with God,but if they did not measure up then they will not dwell with God.