The relationship people have with God is not that of a parent to a child, it is unique. All it means is there is someone out there that is stronger and smarter than you, unless you're the strongest and smartest person in the world that's going to be true anyway.
Both the OT and NT God raise up the poor, promote justice and some sense of equality etc. At the same time they both destroy empires, punish peoples with terrible afflictions, and carry out (or at least promise) mass killings. The different focus in the NT is because God has come down in the form of man to show how people should live humbly and without sin before God, and ultimately to die for theirs sins.
That might make sense if the NT was written and compiled in fairly modern times. As things stand, that was done at a time of mass violence and oppression, when Judea was at its most nationalistic, racist and generally intolerant. The NT was particularly atypical of its time, and certainly doesn't fit into a historical pattern of developing concepts of morality.
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