I cannot even imagine the size of Hell, but if the New Jerusalem is "foursquare" measuring twelve hundred furlongs (a furlong is 660 feet, making the side of the city fifteen hundred miles long - Rev. 21:16), Hell must be humongous! Jesus used the word "few" to describe the saved in comparison to the "many" who will be in Hell (Matt. 7:13-14). Just to give you some perspective on how big the New Jerusalem will be, Texas is 268,601 square miles in size; the New Jerusalem will be 2,250,000 square miles. The entire United States is only 3,537,441 square miles! Add to that the fact that the New Jerusalem is also fifteen hundred miles tall (which is equivalent to a building with 792,000 stories if each story is ten feet), and you have a lot of room for the saved. Do you suppose God will make it that large to show all of humanity He wanted every single person to be there? After all, if He does not want anyone to perish (2 Pet 5:7), wouldn't He have to have room for everyone if none did?
We know who will populate the New Jerusalem: all those who have placed their trust in Almighty God, but who are those one could meet in Hell? Let me list them:.
ATHEISTS who believe there is no God, such as Karl Marx, Sigmund Freud, Madelyn Murray O'Hare, etc. I Googled "Celebrity Atheists" and got a list of hundreds, some of whom already know they were very much mistaken!
AGNOSTICS who are not sure if there is a God, such as Clarence Darrow, Charles Darwin, Stephen Hawking, etc. Again, some already have had their doubts removed by the One known as "I AM."
RELIGIONISTS who think they know who God is, but who fail to acknowledge the Jesus of the Bible as their Creator and their Savior, such as Buddhists, Muslims, Hindus, etc., and a whole lot of folks who call themselves Christians, but believe that it is by their works that they will qualify for heaven.
The Bible says that the Gospel is the power that God uses to save the lost (Rom. 1:16). Paul wrote that there is only one true Gospel (Gal. 1:6-9); that the Gospel is the good news that Jesus died for our sins according to the Scriptures; that He was buried, and rose again the third day according to the Scriptures (1 Cor. 15:1-4); that salvation is a free gift, and that even the faith to believe is by grace (unmerited favor), which comes from hearing the Word of God ( Eph. 2:8; Rom. 10:17). Paul also wrote "That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved (Rom. 10:9). Period! He did not say, "If you then live like a Christian you are saved." John said we can know we are saved now (1 Jn. 5;13). Nothing we do can earn our salvation, and nothing we, or anyone else does, can remove us from being His child (Jn. 6:29; Rom. 8:35-39)! True Christians are not in a religion; true Christians are in a relationship with God!