Human is primarily driven by two type of emotions:
Egyptian Book Of The Dead, Zoroastiran Arda Viraf and Quran play along those lines..
1. Obey, believe and you will get pleasure... (virgins, wine, honey, fruits)
2. Rebelled, questioning / disbelieving of what I said and you will be tortured for all eternity, burnt by fire, your guts torned up, your tongues cut up, your flesh eaten by alligator etc..
Then I saw souls whose tongues were scraped with a wooden peg; and they ever went down, into hell, head foremost; and the demons ever ploughed their bodies with an iron comb. And I asked thus: 'Whose souls are these? and what sin was committed by them whose souls suffer so severe a punishment?'
Srosh the pious, and Adar the angel, said thus: 'These are the souls of those wicked who have been disobedient unto their rulers in the world, and have been enemies of the armies and troops of their rulers. Now they must here suffer such severe pain and torment and punishment.'
-- Arda Viraf, Chapter 99, Written during Sassanid era, just few centuries before the Quran
Strike fear upon the populace so they will not dare to resist/rebel, promised pleasure and reward for those who obey..
It's proven to be very effective technique to control people behavior... for many centuries... by many regimes around the world from Egyptian Pharaoh, Islamic Caliphates, Roman Empire, Nazi Germany and today's North Korea..