Why do the Churches continue to preach the old image of God as the dispenser of rewards and punishments?
The answer is simple - Power!
The conservative establishment (the rich) usurped the authority of God long ago and they use it to subjugate the masses.
They convince themselves that without rewards and punishments sinful humanity would be uncontrollable.
But the real reason is to support their own position and privilege.
Fear of losing their position and privilege drives them to use more and more Machiavellian mass control techniques.
But this is now reactionary conservatism.
Humankind has outgrown the old image of God.
It is yet to be seen whether the rich will accept the New Paradigm and embrace equality or not.
They have nothing to fear.
They will lose nothing but their fear and guilt.