Mantus

It comes from the Old Testament. God is an imperfect, vengeful, juvenile and dominating figure in that par of the Bible. Like a spoiled brat who gets mad and smashes things when his Lego creations don’t work the way they are supposed to.

The poor generally enjoy this version of god because it gives them hope. Hope in the form of an indirect weapon against those they hate (the sinners). The politicians love this version of god because it gives them a great tool to control the poor. Control that is weaved though fear and knowledge. The malign individuals love this version of god because they can twist the doctrine to justify their own deeds.

We can observe that in an extremely stratified society the older version of god prevails. While in a less stratified society with a large middle class the Christian version of god prevails. If people have the ability to seek knowledge, justice and health from government institutions they will not worry about obtaining these services from the church. Therefore the purpose of religious institutions turns towards dispensing morality. Hense the current trend away from the older infantile god.

Ill call the above an educated guess.