Jehovah has installed his Son, Jesus, as King. The 144,000 will be co-rulers working along with Jesus. Through this Kingdom the will of Jehovah will be accomplished on earth.
The Bible teaches that only the righteous will inherit everlasting life on a paradise earth. (Psalms 37:29) (Matthew 5:5)
The wicked, the ungodly, those who do not know God and those who do not obey the good news of God's Kingdom and Jesus will be removed from the earth. They will die which means they will simply cease to exist. (2 Thessalonians 1:7-9)
If I may ask, if you don't believe in God is there a reason why?