If Jesus paid our sin debt past, present and future, then everyone in the world is already saved, because all sins by everyone now alive were future sins when Jesus died. That being the case, why are so many preachers who teach this doctrine still trying to get people saved? It seems like they are talking out of both sides of their mouth.
John 3:16 is the defining verse here.
“God so loved the World that He gave His only begotten Son that whosoever believes in Him would not perish but have everlasting life.”
John the Baptist said Jesus came to take away the sin of the world (John 1:29).
At the cross Jesus paid the full penalty for every sin of mankind, past, present, and future (Colossians 2:13-14).
But His death will only benefit those who believe He did this this for them personally. That means it isn’t His death that saves us. It’s our belief that His death paid the penalty for our own sins that saves us.
If we don’t believe in Him, we remain responsible for our own sins (John 3:18).
It’s a sad fact that many people will go to Hell, even though Jesus paid for their sins, because they didn’t believe that He died for them. This is why so many preachers are still encouraging people to get saved. They are trying to help everyone understand that we have to believe Jesus died for our sins and rose again in order to be saved.