"For the wages of sin is death; but the gift of God is eternal life..."
Based upon that scripture I would say the so called sinners remain where they were planted in the ground or spread out as ashes.
Those who are "saved" are allowed to spiritually transition from their physical bodies.
"For there is not a just man upon earth, that doeth good, and sinneth not." (This would imply everyone is a sinner!)
Now it's also worth noting Luke 17:21
"Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is (within you)."
Truth be told the only people who know the answer are those who have gone before us. The rest of us either "believe" or disbelieve.
Maybe the notion of heaven and hell was invented to control people's behavior on earth. However for those who follow other religions they're told they are doomed to going to hell since they don't accept Christ as the son of God....etc
"Everyone wants to go to heaven but no one wants to die."
It's not enough to for people to obey the law and or even subscribe to religion. They have to be Christian in order to get into heaven!
Sounds a little immature and silly if you ask me.
God made man and man made religion.