Why should we be obedient to God?
Answer: because we are his children, and he is our loving Father.
We therefore know that God has our personal best interests at heart. It is God's love for us that is the reason why we should obey him.
In other words, obedience not the bottom-line, but God's Love is - obedience is justified in terms of love.
The other major monotheism is not based on God understood as a loving Father, but on an almighty God. The reason for obedience is God's absolute power - for them, obedience is the bottom-line. Obedience is justified in terms of supreme authority.
It is the difference between obedience to your own loving Father, and obedience to your Emperor.