Lacy,
Many Christians understand John 3:3,5 telling us, a person must be born again, or cannot see the kingdom of God, use our common sense, of 'cannot see the kingdom of God' speaks of cannot have eternal life with Christ- salvation.
Nowhere in Bible saying kingdom of God is so called millennial, neither anywhere in the Bible saying that the kingdom of God shall be last for only 1000 years.
Kingdom of God is spiritual from above, and it is eternality.
1 Cor. 6:9-11 & Gal. 5:19-21 both telling us, anyone who do practical wicked things, shall not have eternal life with Chrust, go to everlasting fire.
Bible teaching us very clear and simple.
In Christ
Rev. 22:20 -Amen!